It is when onegetsphysical and wack, as in physically altercating.
Listen, boo! You can't go spazzy wacky on me just 'cuz I threw shade at you! React to my shades with better shades, not with your fists, unless you can't even afford a shade... Ahaha! Now can I get a Rayban? Oh, wait! I'm already wearin' one! No wonder this room looks so shady!
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.