You have to take a piss, but at the same time you have to poo, just slightly, so you decide to just not bother pooping, and just piss, then while you are pissing you realize you really had to poop, and your bowels move to try and release the poo (since you are pissing this is automatically triggered) so you end up standing there with you hand on your ass clenching your butthole as tight as it can go, trying not to **** your pants, while at the same time trying to aim your piss into the bowl. I hate that.