YOU SAID:
i poo poo in the pant
INTO JAPANESE
私はパンツにうんちをうんち
BACK INTO ENGLISH
I poop on my pants
INTO JAPANESE
ズボンをうんちする
BACK INTO ENGLISH
Poop pants
INTO JAPANESE
うんちパンツ
BACK INTO ENGLISH
Poop pants
That didn't even make that much sense in English.