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1. a prison inmate who has become downgraded from the "fresh meat" category to the "worked-in shoe" category

2. a prison inmate who willfully has had sex for more than 25 times with other inmates

3. a pony that has been incarcerated
Hey, stay away from that guy...he's the jailpony of cell block D...
by The Jailpony February 01, 2006
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