Someone from either West Virginia, Minong Wisconsin, or the deep south. Are created by making children from other members of their family. This usually happens because they are so ugly the only other people that will have sex with them is members of their family. Easily noticable by lack of teeth, looking like they have been hit by a train, or bad english.
Billy is an inbred because he is his own grandfather.
Sally sue's daddy is also her cousin.