That's where there's a guy on the bottom fucking a girl in the ass and there's a guy on top fucking her in the vagina creating a triple decker sex-sandwich thus wrecking their peckers.
Jimmy and Tim has a triple decker pecker wrecker with Rachel last night!
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When three males have a threesome and they sit ontop of each other at the same time.
"Bro last night i had a triple decker pecker with CJ and Julian."
Sex move: when three men are having a threesome and the guy on the bottom is giving anal, the guy in the middle is receiving AND giving anal, and the guy on top is getting anal while his dick/her strap-on flops about like an epileptic fish.
โJerry, weโre gonna do a Triple Decker Pecker Tower later, you want in? If so youโre taking top