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An abreviation meaning I'm laughing my fucking ass off usually used over instant messanger such as AIM or MSN.
ilmfao by Thats not my name! August 3, 2008
Related Words
ILMF ilmfao Ilmffu
I lost my feelings for u
Person 1:Ilmffu

Person2: huh?...
Person 1: :,(

Person 1:Doesn’t matter
Ilmffu by Randomperson106 May 20, 2021