i made this up. well maybe someone else did but i thought of it. just added an f on. it means:
Rolling
On
The
Floor
Laughing
My
(BEEPING)
@$$
Off
Dude1: lol i totally hit a dork in the ballz with a dodgeball in gym class
Dude2: rotflmfao
by xx.purple.hedgehog.xx June 23, 2009
rolling on the floor laughing my fucking ass off

usually used in internet interaction, when someone says something funny.
Person 1:
I don't have to spellcheck eevrything

Person 2:
ROTFLMFAO
by tim December 29, 2002
Rolling On The Floor Laughing My Fucking Ass Off. Cyberchat. One states something really funny and the other(s) reply with ROTFLMFAO
User1: There once was a man from Nantucket...

User2: ROTFLMFAO
by Philism January 28, 2003
Stands for rolling on the floor laughing my fucking ass off. Also known as post '04 election syndrome.
Everytime I think of that guy outside the Columbus, Ohio Victory '04 Bush tour stop, I'm ROTFLMFAO at how he kept chanting "Four more days."
by Nikthenyetminder November 17, 2004
rolling on the floor laughing my fucking ass off

commonly used on cell phones and msn
Guy 1:DUDE MY DOG JUST TOOK A SHIT ON THE FLOOR!!!
Guy 2:ROTFLMFAO
by 15marsht October 06, 2008
Rolling on the floor laughing my fucking ass off
That movie i saw yesterday made me ROTFLMFAO
by Conan Edigawa September 18, 2008
Rolling on the floor laughing my fat ass off.
Person 1: I liked the Kill Bill movies.

Person 2: ROTFLMFAO
by AMoniker August 22, 2010
Rolling on the floor laughing my fucking ass off.
XSefiros: that kid is a flaming homosexual....=|
Luca_Goers: ROTFLMFAO!
by XSefiros August 10, 2003

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