To be "shook to the core," you simply can not fathom something resulting you to be in a state in which you can not easily speak other words than "shook to the core." This is a verb used to properly demonstrate your feelings towards something or someone's actions or state of being.
Gabriel: "Did you see what he just did?"
Human: "Yeah, I am surprised!"
Gabriel: "I am Shook to the core! I can't believe it!"
Human: *nods in confirmation*
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.