Circumference

To include in a circular space; to bound. [Obs.] Sir T. Browne.

A longer name for the perimeter of, or distance around, a circle—it is the product of [pi] and the diameter of the circle.

When you're coming and the chick is kneeling and spins in a circle underneath you, such that you create a circumference on her body.

its when you jizz in a circle