|1.||urban double cork|
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.