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1.
it stands for Laugh my big fucking ass off
buddy: im gay
you: LMBFAO
by Noemi September 30, 2003
 
2.
LMBFAO can mean one of two things:
1.Laughing My Big Fucking Ass Off.
2.Laughing My Butt Fucking Ass Off.
Both are very odd things to say.
They cause confusion among many.
PersonA: Yeah,so I saw Brokeback Mountain...
PersonB:LMBFAO
PersonA:*wonders if personB is fat or gay*
PersonA:*wonders which is worse*
by bandanasarerad September 19, 2006