Top Definition
An extremely fat, but surely fly, boy who somehow hacked his way into the clubkids (that's the only explanation) and made history.

Fly + Boy = Flyyboii

Ogoshigetitnow!
Me: Fuck you fly boy.
Flyyboii: dude u cros eyed. i got swag.
by Danny Venom February 28, 2008

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