An insult spoken to anyone who's done something bad to you or insists on wasting your time after you've asked them not to.
After Ron took my sister on a first date he told me she was a little fat and didn't have much of a personality. I told him to eat shit and bark at the moon and never go near her again.
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.