Not yet official, but may be seen used on msn or other online messengers. it is derived from lmao, meaning "laugh my ass off" in online terms. the extra two "f"'s at the end have no real point, but are possibly used to show that the final "o" is "off" in full terms, which is still pretty pointless. A Red haired man is credited with creating the term.
"did u c what happened today, LMAOFF!"
by Timmyohtimmy November 24, 2007