The ninth week of the year in which the Stockholm 6th forms or "gymnasium's" have their half term holiday. In this week long break, many of these gymnasium's hold ski trips to the alps in order to experience the superior skiing experience available. This term was made popular by male seasonairs throughout the alps who look forward to the ninth week of every new year because of the inevitable influx of beautiful, blonde and drunk 18 year old Swedish girls.
"What was your highlight of your season at the Moris?"
"I'd probably have to say the 3 Swedes in a dungeon night of week nine"
"Week nine? Ayyyyyyyyy Ohhhhhh!!"