YOU SAID:

I defacated in my pants.

INTO JAPANESE

私はズボンで衰弱しました。

BACK INTO ENGLISH

I was weak in my pants.

INTO JAPANESE

私はズボンが苦手でした。

BACK INTO ENGLISH

I was not good at pants.

INTO JAPANESE

私はズボンが苦手でした。

BACK INTO ENGLISH

I was not good at pants.