The feeling you get when youre over tired or havent eaten in a while. You get punchy, hyper, goofy, and giggly because your body begins to run off of its natural and reserved sugars
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.