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A simultaneous performance of shitting and masturbating, often done in public restrooms.
Kayla: Wow, I heard some really weird noises when I was using the restroom. Sounded like someone was really enjoying their dump...
Michael: They were probably undergoing Shitsturbation. It's like a self-performed blumpkin with your hands.
by gofgirl983 December 11, 2011
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