An expression of sorrow and/or concern for one's pet duck, who has recently come across some great misfortune.
Veterinarian: I'm sorry, Jack, but it looks like your duck won't make it through the night.
Jack: oh my duck.
Veterinarian: Yes, and we have strapped his bill closed to stop his wailing so as to reduce the complaints from the neighbors.
Jack: oh my duck.
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.