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1.
Kiss my fucking ass! This is an acronym that can be used either as in insult or in a sarcastic manner between friends. Generally considered to be a very vulgar term to be used in only the worst case scenarios like during on-line multi-player games.
Fuck you, kmfa! or kmfa you're lame! or KMFA-KMFA-KMFA!
by l0g1cal May 20, 2005
 
2.
Kiss My Fuckin Ass
or
Kiss My Filthy Ass
shut up and kmfa!
FINE! KMFA!
by ReTardEd_maddi January 27, 2007