during intercourse, when one substitutes another's face for a canvas, deploys massive amounts of fecal matter upon it, then uses their erected penial instrument as a utensil of artistic expression
so...your mother and i tried something new last night. i gave her a mexican face paint...she loved it!
The Mexican Mudslide Is Where One Person is Doing Missionary and you shove a whole as fucking burrito in her mouth while putting beans in her ass and continues to shit them out into your mouth.