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2.
1) yiyf is a short version of letters combined. it means yoda is your father.

2) yiyf is also a short version of letters combined that mean yes it's your fault.
1) person 1 texts "who is your daddy?"
person 2 texts "yiyf"

2) person one texts "it isn't your fault"
Person two texts "yiyf"
by superpersoniscool October 01, 2010
1 1
 
1.
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!
by JoelTheCat December 02, 2010
2 1