Top definition
The formal brotherhood, companionship, or union of men that only concern themselves with the desire for enjoyment and entertainment often involving capricious or unexplainable behavior.
Based in 11231, Brooklyn.
"Jesse, you are excommunicated from the Mean Street Posse."

"Uma's induction ceremony will take place when the Mean Street Posse performs bukkake on her"
by Jesssssie's Giiiiiiiiiirl November 26, 2008
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