An abbreviation for "rolling on the floor laughing my fucking ass off so hard that the cat fell out of the window and didn't die." Used to express extreme hilarity. Seen mostly during chats, or online posts.
Chatter 1: Did you see that guy fall on his face?
Chatter 2: Really? When?
Chatter 1: In the Commons at school!
Chatter 2: Oh, yuh. I wuz like, ROFLMFAOSHTTCFOOTWADD!!!
Chatter 1: lol