YOU SAID:

I can't believe you come so far as to say that because it is very poopy

INTO JAPANESE

ウンチだからそんなこと言うなんて信じられない

BACK INTO ENGLISH

I can't believe you said that because you pooped.

INTO JAPANESE

ウンチしたからそんなこと言ったなんて信じられない

BACK INTO ENGLISH

I can't believe you said that because you pooped.