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1.
Laughing My Fucking Black Ass Off. Same as lmfao but with a little more colour
person one:So then I said YOU DO IT!

(Black)Person two:LMFBAO
by Knee-Grow10 August 15, 2007
 
2.
Laugh. My. Fuckin. Black. Ass. Off or "Big" or "Brown"
"Your Soo Dumb lmfbao"
by Sweeterness May 22, 2009
 
3.
"laughing my fat black ass off"

Used by either black people or sassy gays.
Girl: I'm on my period

Sassy Gay: LMFBAO
by sassyGAy February 24, 2010