1. (noun) an individual who takes a peek at the male genitalia of others, often in a locker room setting or while using urinals
Paul's such a penis-looker; he's always trying to sneak a look at my dick!

by Mutari October 13, 2007
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This high tech device revolutionized the privacy in Men's bathrooms. This device is usually a plastic or metal wall located between urinals to prevent another male from seeing a fellow comrade's penis.
Bob: Dude the guy in the bathroom was totally eying my sausage!!

Jim: Well next time use a urinal with a Penis-Looker Blocker
by Dr. Punaranktash May 24, 2011
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