I pooped myself at school
Why did you poop them at school?
It was time for me to go poop.
We all poop sometime but is is your responsibility to get to a bathroom when you need to poop. If you do not others will think you are nasty.
I wanted to see if they think I'm a nasty person.
Honestly, the probably do. Next time I need you to make sure you get to the bathroom in time.