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1.
Used as an excuse for ditching school/work at the last-minute to go skiing/snowboarding. Most commonly used the day after a snowstorm so that you can ski/board on some nice fresh powder.
I can't make it into work today; I've got powder fever.

I called in sick with powder fever so I could go ski some fresh tracks at Vail.
by Sir_Big_Bad January 28, 2011