look up any word, like dirty sanchez:
 
24.
lmfao meens:

Laugh
My
Fucking
Ass
Off

there is also a group called LMFAO. they are good. check them out. ;)
angela: did you hear about lauren falling down the stair at school?!?!

ariel: LMFAO.
by angieeeeeeeee9 September 11, 2009
 
1.
Laughing my fucking ass off
Someone told me Michelle deserved to win Pop Idol, and I was LMFAO
by Hmm. December 23, 2003
 
2.
No, this isn't the fucking acronym.

A terrible band that takes a synthesizer and 2 microphones and a computer and makes millions of dollars from poorly written lyrics and said tools. Their hit song, Party Rock Anthem, neither sounds like a party or rock, more like a rave or hemorrhaging piece of shit. Do not listen to them. Their only half-decent song is I Am Not a Whore, and that's like picking the cleanest dirty shirt in a shit-pile.
Jim: "Hey did you hear the new LMFAO song?"
Al: "No I have a taste in music and you sound like a 13 year old girl."
by freddiemercury832472983473289 August 25, 2011
 
3.
1. Laughing my fucking ass off

2. Name of a Hip Hop band with currently 6 songs on one album called LMFAO. Their Website is http://www.myspace.com/lmfaouno
1. "I'm a newfag can someone tell me how to green text?"

">LMFAO"

2. "I just listened to Yes by LMFAO"
by Anonymous@Anonymous.com August 24, 2008
 
4.
Laughing My Fucking Ass Off. A term used when you are in tears from laughter. Used mostly on instant messaging.
Ben: I did the stupidest thing last nite, i was running down the street with Alex and I ran straight into a pole, i ran so hard i think i dinted it!

Kyle: U are such an idiot. l.m.f.a.o!
by Jessie_xxx November 19, 2005
 
5.
Abbreviated form of "Laughing my fucking arse (or ass or other) off" commonly used in online/networked gaming and in chat rooms, similar to, though more expressive and indicating greater laughment than lmao (laughing my arse (etc.) off).
Absolute pwnage!! lmfao that n00b
lmfao at that pwn
by Fazz May 24, 2006
 
6.
an abbreviation for saying: LAUGHING MY FUCKIN' ASS OFF
HAHAHAHA. that was very funny. L.M.F.A.O.
by Diego Delgadillo November 11, 2006
 
7.
When you are laughing to the point that your (expletive) rear end is being forcibly removed from the rest of your body.
rear end1: why did the chicken cross the road? to get to the other side.
rear end2: thats a good one. lmfao. im laughing so hard im being removed from the rest of my body.