Someone who is just plain dirty, looks like they haven't showered in a month, and when you looks at them you get a chill down your spine. The biggest dirtrats have big teeth.
A undesirable skeevy person, usually also a drug addict or general criminal, or a proud lower class alcoholic New England American with no values......
ya Johnny, that fucken dirt rat. Get a job, ya dirt rat. Ya nutin but a dirt rat
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.