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1.
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
von tim 29. Dezember 2002
 
2.
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
von Philism 28. Januar 2003
 
3.
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."
von Nikthenyetminder 17. November 2004
 
4.
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
von 15marsht 6. Oktober 2008
 
5.
Rolling on the floor laughing my fucking ass off
That movie i saw yesterday made me ROTFLMFAO
von Conan Edigawa 18. September 2008
 
6.
Rolling on the floor laughing my fat ass off.
Person 1: I liked the Kill Bill movies.

Person 2: ROTFLMFAO
von AMoniker 22. August 2010
 
7.
Rolling on the floor laughing my fucking ass off.
XSefiros: that kid is a flaming homosexual....=|
Luca_Goers: ROTFLMFAO!
von XSefiros 10. August 2003