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A person who uses a fictional character to represent themselves either in real life or on the internet, said character having at least a 50%-to-50% ratio of human-animal physical characteristics. Term is also interchangeable with "Furry."
Steve: Hey Dan, what's that over there?

Dan: Oh, that's just some Beastisapien.

Steve: He seems to be rigorously masturbating for no reason...

Dan: Yep. Definitely a Beastisapien.
by SnippyTheDeliveryFox April 04, 2012
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