Someone who looks ugly in one setting but hot as fuck in another. Usually in reference to people you work with when you see them out at the bars or parties that night.
"Holy shit, that's Marcy from work, usually she's fugly, but god damn she cleans up nice, that girl is fucking werehot"
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.