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A piece of metal, usually cylindrical in shape, that should be placed over ones rectal region while sleeping, to alert and wake you if someone is trying to fuck you in the ass.
My room mate pete likes to try to fuck me in the ass while i sleep, so i slept with a pie-pan to wake me with a "ting , ting , ting" in case he was trying to penetrate.
by Brandolino the hung one March 02, 2012
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Adult female genitalia that is naturally hairless or nearly so.

Origin: from Chinese /baiban/ "blank Mahjongg tile"
She's sporting a real piepan!
by Eyedunno August 30, 2005
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