The act of fornicating while simultaneously riding down a snow slope on a sled while the female is on top. The exact moment of the Urban Double Cork is when the sled hits a bump or a ramp, and the mounted female's bounce is unintentionally enhanced, creating a pop sensation at the end.
My favorite Christmas present this year was the Urban Double Cork. My girlfriend gave it to me on the kiddie slopes.
by EDRunchman October 04, 2010

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