From title of 1965 single, "I'm Rowed Out," by punk garage band, "The Eyes." Means: you put all your time and effort into something (or someone), and it was all for nothing; you ended up depleted, exhausted, and unappreciated.
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.