I have to admit this is a bad one, but please remember that I am just the messenger.

So out in the backwoods a son asked his redneck father. “Dad, I see in a lot of pictures that many of these city girls have a small ring in their navel. What’s that for?”
The redneck father paused for a moment, and then replied “Son, I reckon that’s the loop they use to hang the air freshener from.”