Used as a way of making others aware of a sighting of a note worthy bum/arse.
More established users of the word may also use it as a way to announce that a night us going well.
A group of lads walking through the streets of Killarney might gaze upon a particularly exquisite femalebum, they then look at each other and proclaim “Good Arse!”
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.