Nunu has easy time farming, able to counter the enemy jungler, a huge slow, high sustain and an AS/MS steroid. The only problem is falling off late game. However, that can be reduced by giving him an semi-AD build with cost efficient AD items, then building full tank. It allows him to do his late game job of peeling for carries and also clean up teamfights or duel. It also makes him better in skirmishes where an extra source of damage is more useful than in teamfights.
FHMarshy1 votesI've done AD nunu in top lane but not in jungle. I went 
TehNACHO1 votesOh, that looks like what you build for a Raid Boss. Just buy a Frozen Heart and have 10% CDR from your runes and masteries, and you have a dedicated Raid Boss build right there.
GanksLikeGast0n1 votesWhy the trinity force? I feel like he couldn't proc it enough to be useful.
TehNACHO2 votesThis is an incomplete Raid Boss build; he should also have 40% CDR in order to pull it off to its best.
If he had 40% CDR, Nunu's snowballs are on a 3.6 second cool down. Not the best (compared to say, Trundle or Jax), arguably, but still more than enough to make decent use out of Trinity Force.
FHMarshy1 votesExactly what i had in mind. The last item was situational between more Armor, MR, CDR+AD, or just Health
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FHMarshy1 votesTrinity force for the a lot of reasons ~
With Blood boil on, the attack speed he has from botrk and triforce would allow him to eat them minions non stop.
BluePolarizer1 voteshow was it?
FHMarshy1 votesIt's pretty fun and takes people off guard, but there are definitely better options for this build and lane.
I'd say take nunu for a normal game with this build and see if you like it. I wouldn't recommend to take this directly into ranked if you want to win :)
Sirsir1 votesPersonally I don't play Nunu often, I just don't have an aggressive enough play style, but when I do I go with , it works really well on him especially considering one of his Consume buffs are on-hit based. My build is typically 
, its weird, but it works pretty well as long as you keep Mystery Meat (i think its called) up