YOU SAID:

I have a nasty potty mouth

INTO JAPANESE

私は厄介なトイレの口があります。

BACK INTO ENGLISH

I have a nasty toilet mouth.

INTO JAPANESE

嫌なトイレの口があります。

BACK INTO ENGLISH

Bad potty mouth.

INTO JAPANESE

取るに足らない口は悪い。

BACK INTO ENGLISH

Potty mouth is bad.

INTO JAPANESE

トイレの口が悪いです。

BACK INTO ENGLISH

Potty mouth is bad.