The feat of having sex with a Danish, a Swedish and a Norwegian girl over your life.
More difficult versions of these are the Scandinavian Triple and the Golden Scandinavian triple.
A Scandinavian triple is said to be accomplished if you sleep with the girls from the three nationalities on successive nights.
A Golden Scandinavian Triple is achieved on having a foursome with the girls from the three Scandinavian Countries. A feat not achieved in recorded history so far.
I finally managed to complete my Lifetime Scandinavian Triple.
Well, finally, at least u managed it before Djokovic got his career Grand Slam.