(informal) Regularly using vulgar language, especially strong profanities.

(idiomatic, euphemistic) The characteristic of regularly using vulgar language, especially strong profanities. / (idiomatic) A person having this characteristic.

Tending to use obscene or offensive language.

plural of horse's mouth

(idiomatic) An authentic source; someone who directly experienced or witnessed something.

Alternative spelling of badmouth

present participle of bad-mouth

simple past tense and past participle of bad-mouth

Third-person singular simple present indicative form of bad-mouth

Violent; aggressive; vigorous.