near the knuckle
US /nɪr ðə ˈnʌkəl/
UK /nɪr ðə ˈnʌkəl/

1.
al limite, sconcio, volgare
almost offensive or rude, especially because of being sexual or involving rude humor
:
•
His jokes were a bit near the knuckle for the family gathering.
Le sue battute erano un po' al limite per la riunione di famiglia.
•
The comedian's routine was quite near the knuckle, but the audience loved it.
La routine del comico era piuttosto al limite, ma il pubblico l'ha adorata.