that feeling you get in your bum after you do a long, hard poo that makes it uncomfortable to sit down for a while.
(troye sivan walks in the room after leaving for a long time and stands next to his boyfriend, jacob bixenman, who is sitting down)
jacob : sit down, troye
troye: n-no i'm good
jacob: OHHHH sorry i see what's going on
troye: hm - what?
jacob: you have poo bum, no fuss
troye: omg is that what u call that, like, tingly, moist, harsh feeling right up your bu-
jacob: yES! YES.. no more description, please.. but yes that's what it is