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Involuntarily making obscene or inappropriate utterances and remarks. It has been described as parrot like or repetitious in nature and it can be traced back to childhood. Some signs of a child that may develop this issue are tics, grunting/groaning noises and shouting as well as compulsive movements of the arms. It can be, but is not always, a characteristic of Tourette syndrome. It can also (upon rare occasion) be a sign of schizophrenia.

You can find a much more detailed explanation of coprolalia here:

APA Reference
Fournier, G. (2018). Coprolalia. Psych Central. Retrieved on July 8, 2020, from