Top Definition
Refering to an enourmous penis.
Whoa! That guy has a penisaurous-rex.
by The Real Cullen August 09, 2006
5 Words related to Penisaurous-Rex
a bulging bubbling penis longer than 8 inches or a dinosaur's erection.
"that collin has a penisaurous rex."
by peniswhore45 January 18, 2009

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