The sexual act where one defecates on a partner's face, then proceeds to rub
said faecal matter into the face with a back and forth motion of the buttocks. The buttock cleavage should form a groove into which the nose slots, providing a guide for this motion.
This was allegedly the act to which
Meatloaf referred to in the
iconic song lyric: "I would do anything for love, but I won't do that".