A threesome when a man lays on his back and penetrates the ass of a woman (anal), while also giving anilingus to another women.
Bruh 1: You ever had a threesome?
Bruh 2: ya bruh! This one time, in band camp, I was on my back with one chick giving me anal, while I ate out this other chick’s asshole. It was tight! Or should I say, they were both tight! Hahahahaha Bruh 1: ahh dude, a classic pooter scooter!