1) A b move is something done by someone that is rather small but incredibly stupid of them. Sort of like the bonehead play of everyday life.
2) A brief moment of no common sense.
Guy 1: I don't know why I just spent 10 minutes getting dressed for the cold when we're about to smoke a cigarette in the warm car.
Guy 2: That such a b move.
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.