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1.
Frantically Rolling On The Floor Laughing.
Similar to rofl, but much more entertaing to other people, as you you are rofling very fast AND all over the place.
Steve was on his computer one day...

spartanppl88: dude, i got 44 kills last night.
Xx5p3@\<3RxX: nice. i killed a guy with a traffic cone. XD
spartanppl88: FROFL!
by A Drunk Panda1 January 20, 2008
 
2.
Fucking rolling on the floor laughing, rofl with an f attached to the front. Everything is better with a little profanity.
Friend - "I want to be reincarnated as a spider, just so I can hear the words - Oh my God it's HUGE!"

Response - "frofl"
by DeathReaverX September 09, 2011