A term originated in the game SWG (Star Wars Galaxies), in which you would type Rofl Coptorz while making your character spin as he/she rolled on the floor laughing, looking similar to a helicopter blade.
n00b: What the fuck is Wtf?

ub4Rl33td00d: Roflcoptorz!
by Isneak July 7, 2008
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