Top Definition
pen·io·saur (pen-nigh-o-s-argh'us, wre-cks-) A very large vagnivorous peninosaur of the Upper Crustaceous Period of North America, characterized by a small neck, large head and scaley skin. A vaginal intruder, the true king of the peniosaurs.
In a prehistoric times, it wasn't all that uncommon for a peniosaurus rex, to destroy a whole flock of ptwatodactyls.
by Mattie Macabre November 10, 2007

Free Daily Email

Type your email address below to get our free Urban Word of the Day every morning!

Emails are sent from We'll never spam you.