Noun: A sexual act wherein one party defecates upon the chest of the other, and commences to squish aforementioned feces through ones toes.
Verb: To perform a hot piggy. See above.
David and Jill were making passionate love when suddenly David squatted over Jill's heaving breasts and took a massive shit. He then turned to face her and rubbed his feet in it, moving the steaming pile between his toes. "Ooooo," Jill squealed. "I love a good hot piggy!"