At home we refer to poo as "pangsai" (in hokkien) or simply "umm mmm" and pee as "Shee shee".
I have no idea why but the kids love toilet talk. They would often come to me to describe their pee and poo. I guess that this simple process fascinates them. Well, they use Chinglish in their toilet talk as well.
My boy: Look mummy, I have two umm mmms
MG: Are you done?
My Girl: No, I am still shee sheeing
Looking at the bright side, at least they know their participles and singular/plurals. Lol!