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 worktoday; I've got powder fever.
I called in sick with powder fever so I could go ski some fresh tracks at Vail.
A Shackteau is a humble, weather-beaten, structurally questionable shelter located in a spectacular or highly coveted place—Wales, Jackson Hole, Sun Valley, Crested Butte, coastal Maine, the Alps—where the building itself may be worth almost nothing, but the dirt, view, access, and mythology make it absurdly valuable.
In use:
Shackteâu - We thought it was an abandoned shed until the realtor called it a rare alpine Shackteâu with unobstructed views and listed it for $2 million.