Top Definition
1. Rolling on the floor laughing my butt off
2. Often used to express your laughter
P0ptart - THAT WAS HILARIOUS NOW I'M ROTFLMBO!!!

Toa5t3r - SAME :P
by Gypsyaaaahhh August 27, 2007
roll on the floor laughing my butt off
after someone tells you somthing funny.... u can say this.... rotflmbo
by gunit555 January 02, 2009

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