From Longman Dictionary of Contemporary Englishfoul-mouthedˌfoul-ˈmouthed adjective SWEARswearing too much Harry was a nasty foul-mouthed old devil. —foul mouth noun [countable]
Examples from the Corpus
foul-mouthed• If kids are foul-mouthed and rude, it's probably because they hear that kind of language at home.• Kinison was known for his screaming, foul-mouthed comic routines.• a foul-mouthed man 