Negative Penis 

when someones penis is so small that it comes out their asshole. Commonly used as an insult.

Bob: Hey markm, your penis is so small, you've got a negative penis going on!
Mark: Shut the hell up Bob

Negative Penis by Zakk May 17, 2003

hardening of the penis 

a painful condition in which the penis remains erect for a long time.

Since the guy is suffering from hardening of the penis, he should see the sex doctor.

hardening of the penis by uttam maharjan March 28, 2010

blow (penis snot) 

ejaculate

Man, I like to blow penis snot in her face

blow (penis snot) by Anonymous July 16, 2003

small penis 

Tiny little thing that your brother has or your b/f

You: Geez, you wanna put that thing in me?
Your b/f: Why not?
You: Fuck, that couldn't make a rat orgasm

small penis by vicki May 27, 2003

pretty penis 

Any penis that is over 10 inches, very thick, bold viens, the tip is 2 times thicker then the shaft, and or looks like an arrow.

the way it moves looks like a pretty penis

pretty penis by Edger II June 1, 2006

jean penis

when you sit down and are wearing jeans your zipper thing will stick out. this is called a jean penis. or jean peen.

person 1: don't wear those, they give you a major jean penis when you sit.

jean penis by i[dont]loveyou. January 18, 2008

Christmas Tree Penis

A quote from the Youtube series 'The Missadventures of MarVex' by Spoony-Chan and Arxaith.
It is used a lot by mainly one person in it, Marluxia (spoony-chan), and he uses it towards Vexen (Arxaith). It basically means an old man's you-know-what.

Marluxia(Spoony): You have a christmas tree penis!

Vexen(Arxaith): What does THAT mean?!

Marluxia(Spoony): *in a sing-song voice* Dead from the roots up and the balls are just for decoration!

Christmas Tree Penis by Lumaria December 1, 2009