YOU SAID:

I have pooped my pants

INTO JAPANESE

私は私のズボンを突っ込んだ

BACK INTO ENGLISH

I thrust my pants

INTO JAPANESE

-　パンツの中でオシッコした

BACK INTO ENGLISH

- I peed my pants.

INTO JAPANESE

-　パンツの中でオシッコした

BACK INTO ENGLISH

- I peed my pants.