A woman (or man) who has an insatiable hunger for male genitalia. These individuals prefer to go balls deep. The mere sight of a penis is often enough to whip a Penis Monster into a nob-gobbling frenzy. Usually Penis Monsters are not sexually satisfied until they get some dirt under their fingernails. The opposite of a cock tease, a Penis Monster is a definite cock please.
Guy 1: Oh man!!! Cindy was awsome last night. She was a total Penis Monster.
Guy 2: Just remember Penis Monsters don't love you. They love the pee pee.
by Edwin Wiggins March 1, 2010
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A Monster who chases small children around, grabbing and/or molesting little "weiners." Usually ends with jail time and/or new boyfriend named bubba from cell 19.
by Little bobby February 23, 2005
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a monster that lives in Alabama who has a penis for a face he seeks children in the night to deep throat them so hard that they choke
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This is a man who likes to show himself on the website chat roulette. He is often seen by himself. They are generally scary, and can get their kicks no other way.
Person A: So I went on chat roulette for an hour last night...

Person B: Yeah, was it fun?

Person A: No...I kept a tally. I was on for 1 hour, and I got 10 penis monsters, 2 naked women, and 3 French guys.
by Alienne March 24, 2010
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a little, green penis shaped creature with eyes and a huge grin with somewhat pointy teeth that runs in place on 4 legs. (This is only in visible form.) He is also known as Bob the Invisible Penis Monster.
Aaahhh! The Penis Monster is going to attack me!!!
by LauReNiZzLe March 17, 2005
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A completely random word I say to my friend
Me: Penis monster 👻
Friend: wtf is wrong with you
by Geeesty October 16, 2021
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Sometimes known as MP. A penis that when erect is longer than 9" and has a circumference of no less than 7" (diameter of slightly more than 2"). Prolonged sexual intercourse with such an MP will likely cause vagina pain that lasts at least a week. This is not to be confused with miniscule penis, as it is the polar opposite.
Ruby: So, how was your night last night?

Candy: Great, but my vagina hurts because I had sex with a monster penis. I can't even sit down, laugh, or sneeze without discomfort.

Ruby: I hate when that happens. Damn, men and their MPs.
by Ruby569 January 22, 2011
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