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In page Coprographia:

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Coprographia is involuntarily making vulgar writings or drawings.[1] The word comes from the Greek κόπρος (kópros), meaning "feces", and γραφή (graphḗ), meaning "writing".[citation needed] Related terms are coprolalia, the involuntary usage of obscene and/or profane words,[2] and copropraxia, the involuntary performance of obscene gestures.[3] It should not be confused with the behavior of smearing actual feces, which is called scatolia.[4]