YOU SAID:

I pooped my pants in my mom's car last night.

INTO JAPANESE

私は昨晩、母の車にズボンを入れた。

BACK INTO ENGLISH

I put my pants on my mother's car last night.

INTO JAPANESE

私は昨晩、母の車にズボンをはきました。

BACK INTO ENGLISH

I put my pants on my mother's car last night.