Its a combined definition of fat tire and bicycle. Fat tire is a fat chick that you bang in the belly button. and a bicycle is a slut. So a fat tire bicycle is a slut that is fat and you don't wanna fuck her pussy so you stick it in her bellybutton.
by The-effin'-man January 26, 2010
Get the fat tire bicycle mug.A: Man, take a look at that thing. What the hell is is?
B: Looks lika motorcycle without the engine.
A: Yeah, its a motor-bicycle.
B: For damn sure.
B: Looks lika motorcycle without the engine.
A: Yeah, its a motor-bicycle.
B: For damn sure.
by jauntyjackalope June 4, 2010
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