A person who uses obscenities, vulgarities, or profanities in their speech, especially at inappropriate times. Used especially in reference to a child or as a childish rebuke to an adult. Hey, you little toilet mouth! If I hear you speaking like that around your grandmother again, you're going to be grounded for a week! Well there's no need to be a toilet mouth about it, Rick. You could have refused like a civilized person.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
See potty mouth
McGraw-Hill's Dictionary of American Slang and Colloquial Expressions Copyright © 2006 by The McGraw-Hill Companies, Inc. All rights reserved.