Someone suffering from the Dunning-Kruger effect who believes s/he is far more capable than is true. Though the opposite can also be true and high performers underestimate themselves, dunkrug has a derogatory connotation. The term may also be used with respect to knowledge.
Only dunkrugs argue it's unnecessary to wear masks in restaurants when walking to their table.
I hate meetings with know-it-all Jim because he's really such a dunkrugger.
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.