The shorter and more commonly used version of the term "Pro Extreme Beast". Which means "What you say when describing something or someone that is amazing. It is usually shortened to just Pro Ex Beast."
"Wow that guy is Pro Ex Beast at Call of Duty." or "That kill cam was so Pro Ex Beast!!!"
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.