MG: Come on, lets wipe that bottom. (After a poo trip to the loo/toilet)
My Girl: Yes, its dirty because got "mm mm" (poo) and "shi shi" (pee) too. When you "mm mm" and "shi shi" at the same time, the "mm mm" will melt and everything will become smooth smooth.
On another occassion.......
My Girl: Mummy look! Got two small "mm mm" and one big "mm mm"
Eww... Have I spoilt anyone's appetite? LOL!