Top definition
1. A small dinosaur with a monkey on its back.

2. A term for any homosexual act in which both partners are naked and the hairy partner climbs onto the back of the smaller, submissive partner.
Joe: Dude, Andrew totally just dimatroned Kevin in your living room.

Ryan: Yeah, they get prehistoric like that all the time.
by Roley June 10, 2008
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