1 definition by CapnNorric

Top Definition
A creature who thrives in backseats of things, especially cars. He can get along just fine on the back of a bike, though.

A creature made up by The Lonely Island
Driver: There's something living in the backseat of my car!!

Passenger: It's just a backseatsman...
by CapnNorric July 13, 2010

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