Copropraxia is a tic

Tic

A tic is a sudden, repetitive, nonrhythmic, stereotyped motor movement or vocalization involving discrete muscle groups. Tics can be invisible to the observer, such as abdominal tensing or toe crunching. Common motor and phonic tics are, respectively, eye blinking and throat clearing...

 consisting of involuntarily performing obscene or forbidden gestures, or inappropriate touching. Copropraxia comes from the Greek

Greek language

Greek is an independent branch of the Indo-European family of languages. Native to the southern Balkans, it has the longest documented history of any Indo-European language, spanning 34 centuries of written records. Its writing system has been the Greek alphabet for the majority of its history;...

 κόπρος meaning "feces

Feces

Feces, faeces, or fæces is a waste product from an animal's digestive tract expelled through the anus or cloaca during defecation.-Etymology:...

" and πράξις meaning "action". Copropraxia is a rare characteristic of Tourette syndrome

Tourette syndrome

Tourette syndrome is an inherited neuropsychiatric disorder with onset in childhood, characterized by multiple physical tics and at least one vocal tic; these tics characteristically wax and wane...

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Related terms are coprolalia

Coprolalia

Coprolalia is involuntary swearing or the involuntary utterance of obscene words or socially inappropriate and derogatory remarks. Coprolalia comes from the Greek κόπρος meaning "feces" and λαλιά from lalein, "to talk"...

, referring to involuntary usage of profane words, and coprographia

Coprographia

Coprographia is involuntarily making vulgar writings or drawings. Coprographia comes from the Greek κόπρος meaning "faeces".Related terms are coprolalia, the involuntary usage of profane words, and copropraxia, the involuntary performance of obscene gestures....

, making vulgar writings or drawings.