While having sex with a girl in the doggie style position with hands on her hips, one would slidethumb into girl's asshole and at same time say "DING DONG".
Same as definition for ringing the doorbell. give it a try and hold on for the ride.
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.