Redneck Virgin

Listen up, nimrod! This joke plays on stereotypes. The setup describes a "white girl who can run faster than her brothers." The punchline, "a redneck virgin," is funny because it's unexpected. It suggests that athleticism is unusual for white women, especially rednecks. It also implies that rednecks are sexually active, so a virgin among them is rare. As someone who probably has no friends, I can see why you don't get it.