1 definition by Chris Faily

Top Definition
The act of inserting the metal stand, or in-pin, at the bottom of a cello or bass into any of the orifices of a partner, usually the vagina or anus.
The students knew their orchestra teacher was guilty of inpinetration when they walked into the bass room and smelled the rusty in-pins.
by Chris Faily November 03, 2010

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