When you take a shit and the water splashes so hard directly on your asshole that it becomes clean enough you don't have to wipe anymore.
Joe: Have you ever used a bidet?
Jeff: I didn't need it, i got the Poseidon's RimJob!
A man's rectum so messed up by penetration that it now resembles a female's vagina.
WARNING! Do not google it.
"You got a tight little manpussy on you don't ya? It stinks, nice and good"