When someone who is familiar in your home knocks briefly and then walks in without being formally invited.
Knocks and walks - to knock on the door and enter immediately.
The guy upstairs knocks-and-walks into our home anytime he feels like it. He just goes ahead and comes right in without waiting for "who's there" or "come in" or "coming!"
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.