Top Definition
An African American male who has been incarcerated for some length of time, so as to have taken advantage of the detaining institution's exercise facilities and become well developed muscularly, yet he still looks like a thug...a very strong thug.
1. That's a prison nigger! Don't fuck with him, he'll beat the shit out of you!
2. That black dude over there looks like he could carry off the store safe. What a prison nigger!
by hanksbeer August 18, 2008

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