Given how "poopsing" doesn't roll of the tongue as well, and "poop-ing" is too informal, and since there is not #2 word that matches "Urinating"; "Poopating" becomes a great coloquial replacement.
Roblox funny man who likes to say words like fart, shit, cum, shid, fard, ball, ball fart, balls, wee and poo. Anyone in the Pohatu family generally likes balls in the mouth, just like Hayley.
Mason: i like wee shit cum fart
Us: *straight face emoji in real life*
My humour: *broken*
Us: Mason Pohatu is a fart