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pottymouth

American  
[pot-ee-mouth] / ˈpɒt iˌmaʊθ /
Or potty mouth or potty-mouth

noun

Slang.
  1. a person who often uses obscene, filthy, or abusive language.

  2. a habit of using such language.

    His pottymouth has gotten him into trouble.


pottymouth British  
/ ˈpɒtɪˌmaʊθ /

noun

  1. informal a person who habitually uses foul language

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Etymology

Origin of pottymouth

First recorded in 1965–70; potty 2 ( def. ) + mouth ( def. )