YOU SAID:

my money is where my mouth is

INTO JAPANESE

私のお金は私の口は

BACK INTO ENGLISH

My money is in my mouth

INTO JAPANESE

口の中に私のお金は、します。

BACK INTO ENGLISH

My money is in the mouth.

INTO JAPANESE

私のお金は、口の中では。

BACK INTO ENGLISH

My money is in the mouth.