An older form of ROFL that people now assume to be a new, clueless form. ROTF is documented from 1990{1}; ROTFL from 1991{2}.

{1}: <http://www.catb.org/jargon/oldversions/jarg211.txt>
{2}: <http://www.catb.org/jargon/oldversions/jarg231.txt>
Tycho: Daikatana.
Gabe: ROTFL
Tycho: ROTFL

(From Penny Arcade)
by Iain Dalton August 16, 2008
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Text talk or IM lingo for "Rolling on the floor laughing." ROTFL is the same as ROFL. No one really uses ROTFL or ROFL, most people just use LOL or LMAO or LMFAO.
uglybitch1234imawhore: ur a loser
5678imasturbate: ROTFL
uglybitch1234imawhore: dude, thats not even funny, and ppl dont even use rotfl anymore, they use lol
5678imasturbate: kk then LOLOLOL IM HIGH
'uglybitch1234imawhore has signed off.'
by 1234 I Declare a THUMB WAR December 22, 2008
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chat speak for 'rolling on the floor laughing'
dishdafish90: u know wat i hate?
aut52517: idk. wat?
dishdafish90: peas
aut52517: great. now u have me ROTFL!
by evile February 6, 2006
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Remember of the fat lady OR Rolling on the floor laughing.
( Abbreviations ) Similar to Lmfao
Bob: ROTFL?
Sue: Yeah... I had nightmares!
Bob: Me too!

OR

Shrek: hey.
Donkey: hey...
Donkey: Guess What?
Shrek: What?
Donkey: Chicken Butt!!!
Shrek: ROTFL!!!
by Jonna99 June 7, 2009
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What happens to old people when they laugh too hard. Rolling on the floor laughing and I can't get up
Gran'pa texted that he was ROTFL ICGU after gran'ma got her tits caught in the mangle
by ozbukes16 January 4, 2012
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Rolling on the floor laughing, that you're crapping in the hallway. As seen on the Daily show with Jon Stewart.
".. I just ate an MRE, and I crapped in the hallway of the SuperDome..."

"ROTFL TYCITH"
by Tree-Fitty October 26, 2005
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From a Video on Albinoblacksheep.com Rotfl (Roll on the floor laughing) rhymes with waffles so in a song about being pwned and owned the narrator proudly exclaims "Rotfl my Waffles"
by dickface354 July 5, 2009
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