A spirit duck is crushed when a person passes gas (farts, toots, etc). It quacks but the duck itself cannot be seen because it's a spirit duck. An important distinction from "stepped on a duck"
(Person makes a loud fart). "Oops, I just stepped on a spiritduck."
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.