noun Psychiatry.
the obsessive use of scatological language.

copro- + -lalia

coprolaliac [kop-ruh-ley-lee-ak] , adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
coprolalia (ˌkɒprəˈleɪlɪə)
obsessive use of obscene or foul language

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

1886, from Fr. coprolalie, coined by de la Tourette, 1885, from copro- "dung, filth" + Gk. lalia lalia "talk, prattle, a speaking," from lalein "to speak, prattle," of echoic origin. The obsessive use of obscene language, either through mental illness or perversion.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

coprolalia cop·ro·la·li·a (kŏp'rə-lā'lē-ə)
The uncontrolled or involuntary use of obscene or scatological language that may accompany certain mental disorders, such as schizophrenia or tourette's syndrome.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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