To a person in the US, it is anybody from the South.
To somebody in the South, it is anybody in Mississippi.
To a person in Mississippi it is somebody who lives in a mobile home.
To somebody in MS living in a mobile home, it is a guy who drives a pickup.
To a MS guy in a trailer house who drives a pickup, it is a guy who drives a pickup with a Dale Earnhart decal on it.
To a MS guy in a trailer house with a decal of Dale Earnhart on his pickup, a redneck is somebody who drives around with his dog in the back of the truck.
And to a MS guy driving around in his Dale Earnhart pickup with his dog in the back, a redneck is a guy who puts Coca Cola in his morning coffee.