A perfectly normal erotic activity involving a guy slurping cum out of another guys belly button.
Bruce: "Hey sissy boys, I'm about to cum."
Gary: "Oooooh, cum in my belly button."
Steve: "Yeah cum in his belly button and I'll slurp it out."
Bruce: "We'll play tea cups!"
Steve: "Uh, but will you think I'm gay if I do this?"
Gary: "No we're all macho guys. We'll just pretend we're playing sports!"