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
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.'