Absurd stunt involving David Blaine hanging upside-down above a NYC ice-rink for a couple of minutes, duly extended to mean any publicity-grabbing gig exposing the protagonist as a complete "twatdangle".
From Old English "Twattendang", from the Viking "Twtdnglersk", meaning to hang from the rigging of a longship in an attempt to impress your shipmates.
"Hey, did you see the upside-down David Blain thing? That was like so cool."
"Nah, the guy came down after two minutes for a piss. It was a total twatdangle."
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.