Pissing Out Of Your Ass (POOYA)
When you have such explosive diarrhea that is in a completely liquid form (without the lumps) and feels as if you are pissing out of your ass. There is such a strong steady stream that a passerby who hears you could easily mistaken you for taking an actual piss.
I don't know what was in that meal, but I'm sure you'll be pissing out of your ass (POOYA) for hours.