Laugh My Mother Fucking Ass Off. Similar to "lmao," or "
lmfao," but instead of "Laugh My Ass Off," or "
Laugh My Fucking Ass Off," it adds the impact with "Mother".
Mike: "So the dog walked itself home, ate a pizza, and took a
nap."
Joe: "LMAO!"
Peter: "
LMFAO!"
Scott: "No dudes, LMMFAO."