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A combination of the word penitentiary and dentist. The word is used to describe an uncomfortable place for many, normally called the dentists, but for those who see it as a terrible and inescapable place, it becomes their Penidentuary.
“The young boy loved to eat candy, but did not share that love for brushing his teeth. His punishment: he was sent to the penidentuary!”

“My dentist said that i was on probation, and if I didn’t clean up my act, he would make me go back to the penidentuary!”
by Erica_is_special May 04, 2007
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