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Imagine an ironic mashup of LMBO + LMMFAO.
Friend1: *sees something hilarious*
Friend1: Sends to Friend2 (DM, SMS, carrier pigeon, etc)
Friend2: "LMMFBO!"
LMMFBO by ImperialFleet1 February 17, 2023
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
lmfbao by Knee-Grow10 August 19, 2007
Laugh My Mother Fucking Ass Off - Normally used online when one laughs so hard s/he has to use acronyms... Associated with lmao and rofl...
Mel: OMFG, guess what!!!
Joe: What?!!?!??!
Mel: My cat fell into the toilet. :(
Joe: LMMFAO!!!
LMMFAO by Melfina March 26, 2004
Laugh. My. Fuckin. Black. Ass. Off or "Big" or "Brown"
"Your Soo Dumb lmfbao"
LMFBAO by Sweeterness May 22, 2009

lmmfaosfhibmmff 

laugh my mother fucking ass off so fucking hard i broke my mother fucking foot.
That was hilarious! lmmfaosfhibmmff!
Laugh My Mother Fucking Ass Off. Similar to "lmao," or "lmfao," but instead of "Laugh My Ass Off," or "Laugh My Fucking Ass Off," it adds the impact with "Mother".
Mike: "So the dog walked itself home, ate a pizza, and took a nap."

Joe: "LMAO!"

Peter: "LMFAO!"

Scott: "No dudes, LMMFAO."
lmmfao by #1newboyzgroupie August 6, 2011