fmal
Fuck my ass laughing.

Abbreviation for finding something humorous, in a similar sense as LOL, LMAO, ROFL, LMFAO, ROFLCOPTER, LULZ, LAWL, LAWLIPOPZ, among others, are used.
Random loser: A bra i juss got me a quata ounceeee but ah losst it.

Other dude: FMAL!!!!
