Means : let my fucking ass out !
Gives the same meaning of I ain't on that shit!
used only on the internet !
Guy1: this person is insulting you on his blog !
Guy2: whatever!I DON'T GIVE A FUCK :D
Guy1: HE MADE A GAY VIDEO FOR YOU!
Guy2:IIDGAF!IDGAD
Guy1: -___-' O.o'
Guy2 : LMFAO ! bye..
by YUS YUS BUM BUM September 6, 2010
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Haha! You're soooo FUNNY! LMFAO. yeahhh...I'm sorta gassy...
by Human beings. March 14, 2010
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Stands for "Leave My Fat Ass Open"
Ok baby, I'll make sure I LMFAO when you get here.
by AlmightyCheesus May 1, 2010
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A slang term used in online conversations, with the meaning "Laughing My F****** Ass Off"

See lmao and lol.
I heard The Game was excommunicated from G-Unit, and I lmfao at him."
by Charles March 2, 2005
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A: Yo, did you see that new Vine?
B: Yeah, I was LMFAO!
by Nurmy December 6, 2015
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Gives the same meaning of I ain't on that shit!
used on chatting !
A: this person is insulting you on his blog !
B: whatever!I DON'T GIVE A FUCK :D
A: HE MADE A GAY VIDEO FOR YOU!
B:I DON'T GIVE A FUCK ! I DON'T GIVE A DAMN!
A: -___-'
B : LMFAO !!
by YUS YUS BUM BUM September 4, 2010
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