The Imperial Wiggle.
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This appears to have been developed by snowboarders as it has a definite bias at the top and some abrupt edge changes that don't coincide with how skier's would make the wiggle. It isn't obvious but it starts at the top left and then turns down the fall line.
It was particularly challenging being the first down it after fresh snow as the fresh would grab the tips of you skis while trying to skid the entire ski through the turns. My most successful technique was when I was heavily on my tips, almost buttering, with my tails sliding way up on (and out) of the trough.