Norwegian Sled Ride
First off, the girl must be wearing a Viking Hat before you start having sex. Then you go outside in the snow, both of you totally naked and have sex. When it's time for you to bust, you bust on her stomach and then push her down the hill, thus creating the norwegian sled ride.
"Bro, I just gave someone the Norwegian Sled Ride, it was the best thing since I gave her the Birmingham Booty Call."