A Mississippi Facial is when you are doing 69 with a girl standing up and right before you nut, you pull out and then quickly drop her head down under your ass and shit on her face, then pull her body up and spread the shit all over her face with your dick and balls. Then this part is optional (lay her on the ground and piss all over her face to wash the shit and cum off.) I think the name is self-explanatory
I gave Katie a Mississippi facial last week and her skin is glowing like an angel. She could use a shower though.