A usually legitimate grievance against a particular person. The offending person either is unaware of the grievance or has been studiously avoiding acknowledging it - usually the latter - and will probably never acknowledge that this is a real, legitimate complaint.
I've got a bone to pick with you. You really violated my personal boundaries yesterday, and that wasn't cool.
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 $2million.