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1.
An acronym, standing for: Rolling on the Floor Laughing my Fucking Ass Off out Loud. Usually used when something is the highest level of funny.(Usually used in Texting and/or IM'ing.
(IM)
UrbanDictionary321: My ROFL COPTER goes SOI SOI SOI.

NaziLeprechaun666: ROTFLMFAOOL!!!!!!!
by Justin McIsaac May 08, 2008
 
2.
Rolling On The Floor Laughing My Fucking Ass Off Out Loud
(the new "lol")

Combining; Rofl, Lol, Lmao or Lmfao, to make one giant acronym of awesomeness.
Person A:She went around giving random guys she doesn't even know her number last night.

Person B:Wow what a slutty whore!

Person A:I know! She does it all the time! Its so pathetic.

Person B:Very pathetic, and desperate too...

Person A: But I guess in order to be a slut or a whore, you actually need to be able to get guys...

Person B:...rotflmfaool!!!
by Outlaw52493 August 25, 2010
 
3.
rollin on the floor laughing my fuckin ass off out loud
That kid just major fail on that treadmill ROTFLMFAOOL (TxTn this tho)
by the.shiznit October 25, 2009