The act involves female laying stomach down, thus assuming the "prone bone" position and a male top. As the male is about to ejaculate, the female takes a big fat shit as he simultaneously busts a nut on the heaping load of defecation festering over her ass cheeks.
Czechoslovakian Meatpie, A Love Story:

Charlie Cox: "Would you like to assume the position for a Chechoslovakian Meatpie, bitch."
Bitch: "That would be lovely, Charlie. I'm pushing, blow over me hot stud!"
Charlie Cox: "Oooh baby , right on that steaming pile!!!"
by vagangusking666 November 30, 2016
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