I had a jungler tell me he wasn't coming bot to help us cause we fed a bot lane Ekko. He had 2 kills. The jungler hadn't actually ganked before this either, so.... But my real question is What is fed. In bottom MMR I can call a game one way or the other by level 9 (for the most part). To me, 2 deaths isn't a feeder or FED. By mid game, what is FED to you? Leave Tryn and Kat out of the discussion. They go by a different st of rules IMO.
ZACKandATTACK1 votesFed has different meanings. 1: "You fed xxx" This means you gave enemy 3 or more kills IMO 2: "xxx is fed" This could mean enemy has lots of kills, cs, or both.
Onimus Terlain1 votesWhen you feed someone, that is typically 3 or more deaths during the laning phase.
Someone is fed when they have 3 to 5 kills by the end of the laning phase, they have 10 kills by team fighting and 15 kills by end game.
And obviously CS is factored in as well.
HaIlMonitor1 votesKills don't always matter when it comes to fed. Free farming can also be a big part of this also. 
for example could be 0/0/0 with 500 stacks at 20 minutes and be out of control when it comes to team fights. If it is purely off of kills though I would say 3 typically.
Fauxfire1 votesKills don't matter to gold leads. Gold leads don't matter to objectives and team-play.
Occams Raiser1 votesUhhhh. ok
BluePolarizer1 votesAhri: 1 kill = fed.
Occams Raiser1 votesgawdamn
BluePolarizer1 voteshappened too many times where Ahri goes 0-5 in lane then picks up 1 kill, and it starts the comeback snowball that no one can stop due to our team comp lacking point and click CC. Unlike Kalista, who you can chase down as fast melees like Yi, Hecarim, Irelia, Zed, Rengar, etc. Ahri has hard CC and burst mobility so only point and click CC works against her.
rockdalian1 votesI just went cho mid gave lux 4 kills nunu my jungler gave her 2 and we steam rolled I went from 0/4/0 to finish 8/6/10 lux also started by leaching exp from her jungle so she was 2 by end of first wave. fed never means loss unless multiple enemies are fed I've seen a lot of people great at the game but stay in bronze/silver cuz they don't understand teamwork yes i kinda suck but not due to mechanics or knowledge too much but processing the map and objectives too slowly
Occams Raiser1 votesAgreed
ScurvyNave1 votesKills mean more to certain champs than others. I consider a Zed who's 2/0 in landing phase fed. Whereas a Mundo with two kills during landing phase is manageable.
Basically saying that some champs are "fed" with much fewer kills than others.
rockdalian1 votesI understand what your saying but mundo is kinda a bad example I can be down 2 deaths as mundo and once I hit six steamroll top lane unless it's riven I hate that witch
ScurvyNave1 votesTrue enough I've fallen behind as munro many times and still have won lane. I believe this is because Mundo's power is more based around items and levels. Once he gets to a certain point his hp costs on abilities don't matter and he can survive anything, similar to Vlad or Morde.
Blu3 Blood Blues1 voteskills dont matter. its having ALOT more gold than you normally should have. You are technically suppose to just go even, having extra items that you wouldnt have without the extra towers/kills/minions is fed.
Occams Raiser1 votesKilling and dying matters. It just happens to matter what you are dying for.