Overused insult which found his birth in yet another 4chan general, mostly used when people run out of valid argument in a discussion or decline advice.
Anon A: I share this opinions because of facts A/B/C.
Anon B (as answer to Anon A): need a diaper change purefallen?
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.