What does lmfao mean?

Every body is telling me lmfao what doea that mean?

It stands for 'Laughing My F***ing A** Off'.

Laugh My Fu**ing A** Off

I don't know... MY BFF JILL

THANX you GUYS SO MUCH IT REALLY HELPS ME A-LOT

lmfao means... laugh mt fckking arse off... lmao means.. laugh my arse off. so whatever you do, dont take offence to it oz it don't really mean anyfing lol

oh and just inase you come aross this one... raofl... it means roll around on the floor laughing.. just fort I wud warn ya lol

and this one, roflmao, roll on floor laugin my azz off
haha
just in case...

and rotflmao means rolling on the floor laughing my a** off