| 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 OED 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) |