sex position that occurs in a threesome with two guys and one girl.
The two guys have sex with the girl at the same time, one penis is inserted into the vagina, while the other is anal.
Derived from the "double-headed dolpin", where a hand is used instead.
Guy #1: "Hey dude, how did that threesome go last night?
Guy #2: "Oh man, it was insane! we gave her the double dolphin. She totally squealed."
Guy #1: "Nice!"
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