The act of viciously sodomizing a female that has profuse acne in and about the buttocks area. The massive thrusting motion ruptures the white tops of the zits, cause all the accumulated pus to spill out onto the butt cheeks and into the colon. Often used as a 'natural' lubricant to aid in the anal penetration.
The aftermath usually leaves a large and unsightly mess on both participants.

When you eat dirt for the first time and leave your family to build a shack in the woods