Whitser Mud Pie
When you mix poop, water, vomit, and 1/2 teaspoon of baking soda in a cup, and then fuck your girl missionary.. then pull out and act like you're about to nut on her tits, but instead of nutting, you grab the cup from behind you and dump it on her chest.
She forgot to put mayonnaise on the sandwich I took to work this morning, so I gave her a whitser mud pie to return the favor.