A "fedneck" engages in behavior commonly associated with a typically white male redneck - such as wearing hats, driving trucks, chewing tobacco, and going deer/coon hunting.
a: noun A resident of Frederick, MD who although a redneck in attitude and accent will listen to rap and dress in a hip hop style possibly mixed with normal redneck couture.
Justin is such a fucking Fredneck! This douche bag is sitting on a tractor with a Raiders hat and jersey, baggy ass jeans and a pair of cowboy boots with a boom box strapped to the back blaring Insane Clown Pussy, I mean Possy.