Purple neck is a hardworking, hunting, fishing, truck driving, Redman chewing, rodeoing, country music listening, black person.
A Black Redneck
"Hey, is that black guy wearing Wranglers and Double H's?"
Yeah he is, he is a Purple Neck!"
A redneck that makes the average redneck look like a suave cosmopolitan with a Ph.D. Generally purplenecks are illiterate but they are very friendly as long as you don't show them any foreign technology and try to talk like them.
Yesterday, while driving down the backroads of Mississippi, my car got a flat tire and I was SOL because my spare was flat too. Luckily, though, I met a purpleneck who saved me by slaughtering a wild hog right then and there, and then slicing off a long and thick roll of hog meat to wrap around my tires. I was off and going in no time.