A rare phenomenon that occurs before or after severe thunderstorms in which the undersides of the cumulonimbus clouds look like boobs or bunches of grapes.
Bob, get out your camera! There's some awesome mammatus out by the mountains!
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 $2million.