A dinosaur from the Precambrian era.

Also someone who exibits the properties of a twunt
"That Twuntasaurus stole my bike!"
by cheese January 11, 2005
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The combination of twat + cunt + my favorite dinosaur.
Oh great, the fucking Twuntasaurus Rex showed up for work today...gonna be a long one.
by NullDotCom April 28, 2010
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