Top Definition
An individual who has always been enthusiastic about any activity or opportunity that comes his or her way. These priceless individuals have been around since the Mesozoic era and are known to have a few descendants in South Auckland, NZ.
Sam - "Look at that guy ! He is not from around here is he?"
Bob - "Judging by his behavior, I reckon he is a keen-a-saurus rex"
Sam - "No Way ! You mean a rare descendant of keen?
Bob - "Yeah ! Let's go meet him."
by Dr. Keen October 24, 2011
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