A fork of Rural Dictionary
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
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