Definitions by JoelTheCat

YIYF 

Yogurt In Your Face!

Used when you want to aggressively want someone to either ingest or be splattered by yogurt. Comes up surprisingly often.

Person 1: What do you think you're doing over there?
Person 2: YIYF!
Person 1: Agh! WTF, YIMF!

YIYF by JoelTheCat December 3, 2010