You're fucking someonein the ass while they're turtling and cum in the poop. When you pull out it will look like a friend Oreo because of the cum in between the poop.
When your girl takes a dump, you dip your balls in it, and jerk off, letting your cum leak down between your nuts creating the oreo effect. She then gets to enjoy a tastey after fuck snack when she munches the "oreo."
The best thing in the entire world!
Once a person has experienced it, they will constantly crave it. Especially after a long night of drinking and partying. It's even better if you use hellmanns.