YOU SAID:
HE fiddled with my diddle
INTO JAPANESE
彼は私のディドルをいじった
BACK INTO ENGLISH
He messed with my didle
INTO JAPANESE
彼は私のディルを台無しにした
BACK INTO ENGLISH
He ruined my dill
INTO JAPANESE
彼は私のディルを台無しにした
BACK INTO ENGLISH
He ruined my dill
That didn't even make that much sense in English.