The act of two males performing anal sex on a female, and then proceeding to place the tips of each of their fecal covered penises in a nostril. The males ejaculate blowing semen and feces up into her nose. The female then hocks a lugee of cum and poop, spitting it gently into an used chocolate rapper. This action is known as the belgian double dipper because the resulting viscous liquid looks like a white belgian, chocolate which was then dipped in dark chocolate.
much like the Dutch Double Dipper but with the added benefit of the female partner taking a dump while you do it. This adds an interesting lubrication (of sorts) and also allows you to quite literally push her shit back in.
Rusty Dutch Double Dipper:
Bob: "I heard you Triple D'd her last night man?"
Frank: "You heard wrong my friend, I Rusty Trip D'd her!"
Bob: "NICE!"