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1.
The act of penetrating a bodily orifice (such as an anus or oral cavity) with one's penis while in prison. Sometimes happens by force or willingly allowed. Many men fear prenetration on their way to prison.
"Prenetration happens in prison! I don't want to go there!"

"How was prison?"
-"I was prenetrated there... So it sucked."
by Izraehl March 29, 2010