Top Definition
A prisoner who has sex with other same-sex prisoners yet claims to be straight.
"Yo man, the guard's not looking. Come here and blow me."
"No way! I'm not gay!"
"I'm not gay either man, I'm just INSTITUTIONALLY gay."
"Oh, so it's OK for me to blow you?"
"Totally!"
"Cool! Mmmmf mfff mmm mfmmmm."
by Black@Heart November 15, 2009

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