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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
автор: tim 29 декабря 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
автор: Philism 28 января 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."
автор: Nikthenyetminder 17 ноября 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
автор: 15marsht 6 октября 2008
 
5.
Rolling on the floor laughing my fucking ass off
That movie i saw yesterday made me ROTFLMFAO
автор: Conan Edigawa 18 сентября 2008
 
6.
Rolling on the floor laughing my fat ass off.
Person 1: I liked the Kill Bill movies.

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