LIYF 

Used as an abbreviation for "I Laugh in Ya Face" while IMing someone.
See I Laugh In Ya Face
See Ya Face

Poser: Hey you wanna listen to some "Third Eye Blind" later?
Lew: You are the scourge of the earth! LIYF!

LIYF by STUFF'N'THINGS September 12, 2003

LIYFF 

Laugh In Your Fat Face

Like LMAO (laugh my ass off) but it's LIYFF(laugh in your fat face).

LIYFF by -J3SKA October 17, 2008