Post-Poop Butt Hurt is when, after a particularly bad poop, your butt hurts. Otherwise known as PPBH.
Person #1: Aw, man, I took such a big dump yesterday that it gave me PPBH!
Person #2: PPBH?
Person #1: Yeah, Post-Poop Butt Hurt
Person #2: Dude, PPBH is the worst!