coprolalia
Definition - Involuntary, excessive resort to obscene or scatological language.

Etymology -
The word derives from the Greek kopros, dung + lalia, a speaking.

Oxford English Dictionary -
Its first citation is from 1886:
"Echolalia and coprolalia may form part of the symptoms of insanity.… The coprolalia is pathognomonic of the disease, according to Tourette."
(Journal of Nervous and Mental Dis., XIII. 412)



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