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Nick name for an awesome male best friend, is typically shortened to Dyno.

A Dynosaur is typically very happy, very hyper, and really easy to love. He's one of the best people you will ever meet. Usually, Dynosaur is very popular but really cares about a few close friends. He's great with the ladies, but dedicated to just you if you're the one he picks. Don't pass up on a Dynosaur who loves you!
Kat: Look at that guy, he's so awesome.
Emma: Yeah, don't you know he's Dynosaur?
Kat: Omg. He's the coolest guy I've ever met.
by littlekookies January 19, 2011