noun, noun or participle which takes 'suru', intransitive verb
Child-friendly word for feces; used by and with small children. The suru-verb form うんちする means 'to poop'.
See also: うんこ
赤ちゃんがうんちをした。
The baby pooped.
犬が散歩中にうんちをした。
The dog pooped during the walk.