RichThesaurus
foul-mouthed
vs
near the knuckle
foul-mouthed
adj
Tending to use obscene or offensive language.
near the knuckle
prep
Risqué, sexual, suggestive of impropriety.
How often have the words
foul-mouthed
and
near the knuckle
occurred in a corpus of books?
(source:
Google Ngram Viewer
)