1 definition by Gmoney56

Top Definition
When one exposes their penis and smacks against a surface, such as a window or an actual person.

You can penis smack someone in the face. But it is considered gay to penis smack another penis.
Yo' Caleb, I'll give you $20 to penis smack Miss Hallian's window!!
by Gmoney56 November 08, 2007
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