fiiy 

fuck it i'm young
more commonly used on the internet that in real life.

online conversation-

friend- you out tonight?
me- i wasn't going to but fiiy!

fiiy by Bethany-Ruth July 9, 2012

FIIY 

The acronym for the phrase 'Fuck It I'm Young'. It's infinitely better than YOLO and much easier to pronounce, obviously.

Matt: You shouldn't eat pumpkin soup whilst recording the podcast mate
Cailem: FIIY

FIIY by Steven. Just Steven. August 17, 2012

FIIY 

Fuck - It - I'm - Young

Justification for doing anything immature, stupid, dangerous or ridiculous

Jimmy: I dunno man, do you really think you should fuck this dead hooker we found here in the forest

Billy: FIIY

Jimmy: Hmm didn't think of it like that, Seems legit

FIIY by SmilesNLulz November 7, 2012