Top Definition
A small mouselike creature which serves as a pet. They spend most of their time in small cages with little wheels, but on occassion they come out to play. People tend to dress them up in little costumes with accesories such as pink bows and top hats. College students love them as an addition to their dorm rooms.
Karla just got her very own mousepup!

Ew, your mousepup is gross.
by ohhyeahhh26 November 09, 2010

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