sewermouth

sewer mouth

1. slang A person who uses obscenities, vulgarities, or profanities in their speech. Used especially in reference to a child or as a childish rebuke to an adult. Hey, you little sewer mouth! If I hear you speaking like that around your grandmother again, you're going to be grounded for a week!
2. slang The use of such foul language. Well, there's no need for the sewer mouth, Rick. You could have just said "no" like a civilized person.
See also: mouth, sewer
Farlex Dictionary of Idioms.

sewermouth

n. someone who uses vile language constantly. (Also a rude term of address.) If you’re going to be a sewermouth, I wish you would leave.
McGraw-Hill's Dictionary of American Slang and Colloquial Expressions
See also:
  • sewer mouth
  • latrine
  • latrine lips
  • potty mouth
  • toilet mouth
  • poophead
  • (it) takes one to know one
  • it takes one to know one
  • takes one to know one
  • How old are you?
References in periodicals archive
One and the same woman is called Sewermouth (Govnorota) owing to her foul language, but also Mashka Goebbels for her frequently voiced demand that all Jews (of whom there are three or four in the town) should be exterminated for placing a hex on her chickens and pigs.
Tales from nowhere: Lurii Buida's stories of Russian East Prussia