You're speaking to someone and they casually talk about something that happened or is going to happen that you had no previous knowledge of beforehand as if you did. They basically assume that you are aware of this.
For instance, if a girl says says to a guy, "we're going cinema this weekend", and he was previously unaware of this then he could say "that's news to me..".
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.