Top Definition
An excessively small penis which was claimed to be, by the owner, a very large penis (or cockasaurus)

Don: Yo I got a cockasaurus.

Bennie: You bullspittin!

Don: Im serious, look!

Bennie: Nah man, thats a mockasaurus. (chuckle chuckle)
by SychoSurge January 13, 2009
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