YOU SAID:

I just pooped on a watermelon

INTO JAPANESE

私はただスイカをうんざりした

BACK INTO ENGLISH

I just got fed up with watermelon

INTO JAPANESE

私はスイカにうんざりしました

BACK INTO ENGLISH

I was fed up with watermelon

INTO JAPANESE

私はスイカにうんざりしていた

BACK INTO ENGLISH

I was fed up with watermelon