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the act of receiving a blow job while taking a shit in the top of the toilet (know as an upper decker). at the same time the girl is reverse straddling the toilet seat, sucking your cock, while taking a shit.
Guy: "Hey I have to take a shit."
Girl: "So do I!"
Guy: "Want to give me a super double blumpkin?"
Girl: "Hell yes, let's go."

Guy: "I could really go for a super double blumpkin right now."
Girl: "Isn't that kind of gross?"
Guy: "Trust me, you will enjoy it."

Girl: "Hey, do you want me to give you a super double blumpkin right now?"
Guy: "Of course I do!"
by Five-StarFratStar August 23, 2011
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