Alabama Circumcision Method

Listen here, you smooth-brained ape. You posted this, so it's safe to assume you don't know what's going on. This is a joke playing on the stereotype of incest in Alabama. Instead of a medical procedure, the punchline suggests violence against a family member, specifically the sister, as a way to 'circumcise' someone, which is not a thing. It's supposed to be shocking and offensive. Got it, you dunce?