Top Definition
An idiotic and naive reference to any motorcycle that resembles the famous line of motorcycles from Kawasaki. More accurately termed sportbike. Sometimes called crotch rocket as well. Often inaccurately lumped together as a group of any non-cruiser motorcycles.
Dude:Hey baby you wanna go for a ride on my motorcycle
Chick: That depends, Is it a Harley or a ninja bike?
by Rob February 27, 2006

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