In addition to, and to clarify, the other definition:
A person (often female) is dressed down when she is wearing clothes that do not accentuate her voluptuous parts (if any).
Despite her attempts to dress down by wearing long pants and a coat, that shit was stillpoppin' out all over the place!
The act of forgetting that it is dress down day and arriving in your regular work wear.
Joey turned up to work in his normal work clothes whilst all his colleagues had remembered to come in casual clothing, Poor Joey has some kind of Dress Down Syndrome.
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 $2million.