What is Double-decker?
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Double-decker, or to pull a double-decker, is when a girl is having sex with two men, whereas one is thrusting his manhood in her ass, and the other man is penetrating her vagina. Often done to completely dominate the woman, and/or a symbol of the friendship between two men.
Man Oscar, we have gots to double-decker that Sandra chick, she is too fine.
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Def 1: When you have sex with a girl that you dont know that shes pregnant and you put your penis in her and you constantly poke the bab..