YOU SAID:

i did a big poo in the toilet

INTO JAPANESE

私はトイレで大きなうんちをしました

BACK INTO ENGLISH

I had a big poop in the bathroom

INTO JAPANESE

私はバスルームに大きなうんちを持っていました

BACK INTO ENGLISH

I had a big poop in the furo

INTO JAPANESE

トイレに大きなうんちがありました

BACK INTO ENGLISH

There was a big poop in the toilet

INTO JAPANESE

トイレに大きなうんちがありました

BACK INTO ENGLISH

There was a big poop in the toilet