All tanks have to do is get a bunch of health and armor, i try having last whisper and bortk and void staff if im on kog maw. but a full build kog maw doesnt even scratch a darius with black cleaver and dead mans plate. how do i beat this tank meta?
dannykun1 votesyou could land your q on darius shredding his armor and MR rendering him vulnerable to your bio-arcane barrage that deals a ton of damage if he stands in it for too long.
Lsatellizer1 votesi try to do that because hey who doesnt like resistance shredding, but then he pulls me with his sniper axe from across the map (seems like it) then 2 hits me. and then 2 hits my team
dannykun1 votesoh darius needs to aim his q to do any damage. literally walk towards him when he pulls you in, it'll confuse the fuck out of him and give you longer to use bio-arcane because he needs to move out of range. also don't use void staff. If you're building a hybrid Kog you should have Guinsoo's and by casting a few spells you can double the Attack speed gains from it, using bio-arcane, which will literally melt anything that's stupid enough to get that close. Your build sounds like what needs some tuning, building hybrid Kog relies on building the following items which should give you close to the 5 attacks per second and allowing you to make the best use of on hits. 
Those are your core Damage items and will let you literally melt anything you touch.
Lsatellizer1 votesi always do build guinsoos, that was also in my endgame build. and as for walking towards darius, everyone does that so most darius' walk away from you and since his movespeed dwarfs yours... dead
dannykun1 voteshonestly your slow should have kept him off you in the first place, and you should have someone there to cc him for you. But if he expects you to walk toward him walk away. His mobility is pretty poor compared to anyone else's before he engages. Also if you want to kite better as a hybrid use your BORKS active to steal movespeed from him.
Part of being caught out is using your available resources to get yourself to safety. THE SECOND you see darius you should throw void ooze between you and him, and then bork him so you can run away while he's slowed. if you have someone that can peel for you. void ooze spittle and the bio-arcane to melt him (possibly before the stun is up), you have the tools that should help you to kill darius with a little peel, or escape when you're alone. in a 1v1 you should easily be able to escape, and you could also kill him by kiting as well.
GhostButter012 votesPart of being caught out is using your available resources to get yourself to safety. THE SECOND you see darius you should throw void ooze between you and him, and then bork him so you can run away while he's slowed. if you have someone that can peel for you. void ooze spittle and the bio-arcane to melt him (possibly before the stun is up), you have the tools that should help you to kill darius with a little peel, or escape when you're alone. in a 1v1 you should easily be able to escape, and you could also kill him by kiting as well.
Nail, meet hammer. Kog is just a very team reliant champ. You have to be VERY map aware and you have to play like you are scared of every little thing that moves.
The Poetic Zed1 votes
play an adc with some sort of mobility/cc, kogmaw is just easy prey
disregardable4 votes
I personally have always thought Karthus is the most mobile ADC.
Ralanr1 votesIf you're kog, have a body guard. Otherwise just kite.
luckmallory1 votesUse Attack-Move effectively
EndlessSorcerer1 votesWork with your team and let them protect you.
Don't fight them 1v1
TehNACHO1 votesDon't stop attacking and kite.
ADCs actually naturally counter tanks, but only if you are able to sustain your DPS over a long enough period of time to wear the tank down.
Lsatellizer1 votesyour response seems to go against the common flow, most say to kite, but you say not to stop and kite but to just try to melt them. care to elaborate? I am very interested
EndlessSorcerer1 votesI'm pretty sure that they meant:
TehNACHO1 votesThis
Penns1 votesMeanwhile the tank basically oneshots you while you do -1 damage to him lol.
IcyPepper1 voteseven scratch a darius with black cleaver and dead mans plate. how do i beat this tank meta?
Darius is not a tank, he is a bruiser (and while DMP has good tank stats, both of those items are still bruiser, not tank items. There's a difference with some overlap). He has damage, not amazing cc. It's an important skill for an ADC player to know the difference, because the counterplay is different against the two, separate, classes.
It's not a tank meta. Far from it.
And to answer your question, it's about positioning, teamwork, and kiting. Kog'Maw isn't stellar at kiting when using his W, so either focus on poking with ult and other spells or time your W when your team can protect you. Now, that's advice if you're actually looking at advice, not looking to just complain and not actually do something. I don't mean that as an insult, it's what some people actually do here. If you're looking for advice, just use your range and stay protected by your team. Don't 1v1 with every ADC (and gods no with Kog'Maw, please don't. You're not playing Vayne with Koggy.
Anyway, instead of void staff, I would recommend Wit's End with Kog'Maw if you're going for an on-hit build. Rageblade, however, is a must. If you don't have rageblade, you shouldn't have void staff. Also, runaan's is so, so, so useful on him.
If you're having troubles with kiting, I recommend 
Lsatellizer1 votesyeah i generally go rageblade most of the time first item. so my question is if i have rageblade should i then do void? or is wits end still better. and as for runaans, why get that instead of phantom dancer, you get more attack speed, and the good passives.
IcyPepper1 votesOkay, first don't get void staff on Koggy. It's... just not that great. Even Wit's End is subpar, I'd recommend just using the champion.gg recommended build for now.
Also, runaan's is better than phantom dance because of the passive. If you're going for an on-hit AS build on Koggy (which you should be doing), you want runaan's because the bolts apply on-hit effects. With runaan's and rageblade, you're not dealing significant single-target damage, you're dealing significant teamfighting damage. Just look at how your W works. It's about hitting everyone like an artillery cannon, not one person like a sniper or hunter. That's Vayne and Caitlyn's job.
Lsatellizer1 votesso phantom dancer theoretically gives you better damage, but you're applying that to just 1 person instead when you could be doing better by nuking 3 people right?
IcyPepper1 votesnods
Phantom Dancer is better with AD builds, but you don't build full AD on Kog anymore, do you? It's all about the on-hits and aoe, which Rageblade (which deals a small aoe?) and Runaan's (which deals up to three units) serve to live up the dream.
When you focus on the on-hits rather than sheer stats, you get the picture for Kog'Maw. It's not about stat efficiency, but item synergy on him.
Lsatellizer1 votesokay then help me get a better understanding, maybe i'm just bad, how is kog maws damage split? 50 50 magic phys? 70 30 ETC
PDE5 Inhibitors1 votesHow is deadmans plate a bruiser and not tank item again?
IcyPepper1 votesPrimarily the passive.
Bruisers are tanky, but are not actual tanks (for the most part). Obviously there's some overlap, with some bruisers being able to fulfill the tank role and some tanks able to build and act as bruisers.
Anyway, DMP is a bruiser item because the stats it gives are tanky and the passive is intended to help close the gap (while being susceptible to cc) and deal some extra damage. Basically it brings both damage and tankiness to the table, which is what bruisers do. Abyssal sceptor is a common item for AP bruisers, since it brings both MR, penetration, and AP to the table. You'll often see more short-ranged AP and AP bruisers alike build things like RoA and Zhonyas rather than Luden's Echo for similar reasons.
Anyway, to help differentiate the two types of items and where they intersect (and dear lord there's quite a few overlaps that make this goddamn confusing, looking at you Randuin's) is items like Frozen Heart or Righteous Glory. Items with passives that serve to aid the team (lowering enemy dps, and strong engaging) that can be decent on a bruiser, but most definitely scream tank. DMP only speeds on champion up, and the passive requires an aa, so it's probably stronger on a bruiser who's going to aa anyway (Garen, Darius) rather than a tank who'll probably open up with a spell (Amumu). Obviously there's cases where DMP might be good on a tank, but sometimes RG or other things do that job and better.
Man, did not mean to type monster paragraphs... a shorter way of saying this is that tank items tend to bring more utility to the table for the team with a more defensive focus, and bruiser items tend to aid the champion individually and deal with a hybrid of tankiness (which does not always equate tank) and damage. There's a lot of overlap, with Randuin's Omen and Warmogs being strong items for both classes, which I suppose makes sense because bruisers and tanks themselves often have a bit of overlap as well.