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3.
An abbreveation for "laughing my fucking ass off".

Used on the internet.
User 1: Goddamnit. Last weekend I didn't eat for 24 hours because I was too lazy to make some food.

User 2: lmfao
by klosterdev October 30, 2004
88 168
 
1.
Laughing my ass the fuck off
LMAFO, that is too funny
by Robicleez October 20, 2011
29 25
 
2.
Acronym: "Laughing my ass fat off"

(v.) - to laugh so hard that you are ultimately burning fat from the butt.
LMAFO, that was the greatest video that i've ever seen!

Wow..that girl's got a giant badonkadonk....LMAFO
by OOJG March 31, 2007
83 96