Noun
dirty mouth (plural dirty mouths)
(slang) The characteristic of regularly using vulgar language or profanity.
The comedian lost his gig at the nightclub because he had such a dirty mouth.
I'm a musician first, a food-lover second, a dirty mouth with feet, and a girl last time I checked. Tori Amos
I have a dirty mouth sometimes, and I'm very liberal, and that doesn't always go down well in the film industry - especially when you've got to appeal to mums and daughters. Amanda Seyfried
Never kiss an opportunity with a dirty mouth. Russian Proverb