YOU SAID:

I ate my little brothers poo on accident today thinking it was chocolate

INTO JAPANESE

今日弟のうんちをチョコレートだと思ってたまたま食べてしまった

BACK INTO ENGLISH

I accidentally ate my brother's poo today thinking it was chocolate.

INTO JAPANESE

今日、弟のうんこをチョコレートだと思って食べてしまいました。

BACK INTO ENGLISH

Today, I ate my brother's poop thinking it was chocolate.

INTO JAPANESE

今日、弟のうんちをチョコレートだと思って食べてしまいました。

BACK INTO ENGLISH

Today, I ate my brother's poop thinking it was chocolate.