the feeling after one has intense diarrea synonims: Reah or heavy sexual activity involving the nether regions in which the anus feels as if it is on fire, burning for hours on hand.
Yo that girl had mad anus burn after Kobe raped the hell out of her last nite.
The act of accidental thrusting of the backside booty of somebody, usually happens in the act of moving, or trying to escape something or someone. Can only happen between two men.
amanda: "WTF. Did you see that? Jonathon just grinded on Josue when i tried to hit him."
Joey: "haha. ...anus burn"