Proper noun. Used to describe ones large, lifted, comfortable, gas guzzling SUV that is driven primarily in the backwoods. A synonym for a Chevrolet Suburban and/or GMC Yukon Xl.
One corporate suburbanite says to the other, while sipping his overpriced latte, "Check out the hick in the Montana Cadillac"! Both giggle as they wait for AAA to come and pull their Audi/BMW/Mercedes out of a snow filled ditch.