Top Definition
N. Penisaurus - Derives from the male organ Penis, suggesting that the intended victim is a large penis (Or the derogative alternative "Cock")
Dave, you are a penisaurus.
by Carl April 02, 2005

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Meaning a very largely,ungodly,inhumane oversized penis.
ohh myyy god! screamed the whore,your penisaurus is so huge, im gonna give you a freebee tonight
by Djay December 14, 2002

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Ginormous monster mainly looking like a dick
and to your left there is a penisaurus
by thatfrenchdude July 17, 2011

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the biggest wang you have ever seen.
when that penisaurus entered my vagina it tore!
by dick a lick March 21, 2009

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dinasaur with a very large twanger
Hey look at the fuckin massive penisaurus's penis!!!

:: if it has short arms its a penisuarus rex !!!
by DEL BOI August 18, 2006

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Slang for penis, used by people who think there penis is larger than everyone else's
Who wants to pet my pet penisaur
by Jim May 24, 2004

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