YOU SAID:

farted on joe mama buttock

INTO JAPANESE

ジョーのお尻に屁をした

BACK INTO ENGLISH

I fart in Joe's butt.

INTO JAPANESE

私はジョーのお尻にオナニーをした。

BACK INTO ENGLISH

I masturbated on Joe's ass.

INTO JAPANESE

ジョーのケツをオナニーした

BACK INTO ENGLISH

I masturbated Joe's ass.

INTO JAPANESE

ジョーのお尻をオナニーした

BACK INTO ENGLISH

I masturbated Joe's ass.