What do you get when you cross a redneck and another redneck?
Incest.
Listen here, smartie pants. You know how rednecks are known for keepin' things in the family? Well, this joke is sayin' that when two rednecks get together, the result is incest. It's a dig at stereotypes, which, let's be real, you probably fit a few of yourself. Don't get your banjo strings in a twist; it's just a joke!