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1.
From Demetri Martin's comedy.

A magical make-believe creature that only exists if you do not believe in it, and if you believe in it it doesn't exist.
"Hello I am a twenty one year old 120 pound virgin with c-sized breasts who does not have a boyfriend and is not crazy." -The words of a paradoxasaur.
by AggiePerspective July 10, 2008
 
2.
A creature that, if you believe in it, it exists. If you believe it doesn not exist, then it exists.
"Hello I am a twenty one year old 120 pound virgin with c-sized breasts who does not have a boyfriend and is not crazy." -The words of a paradoxasaur.
by allatropic February 08, 2007