YOU SAID:
i peed my pants yesterday.
INTO JAPANESE
昨日パンツにおしっこをしてしまいました。
BACK INTO ENGLISH
I peeed in my pants yesterday.
INTO JAPANESE
昨日パンツの中にオシッコしてしまいました。
BACK INTO ENGLISH
I peeed in my pants yesterday.
Come on, you can do better than that.