When you're having sex with your hillbilly girlfriend and try anal for the first time but she never cleans herself and she gives you serious shit dick.
I finally got to have anal sex with my girlfriend and she ended up giving me a hillbilly mudslide. I had to stop right away to take a shower. It was disgusting!
The act of having ones penis wrapped in chains that are tied to a buddies muddin truck. The driver then proceeds to throttle on and off in a way that the truck moves to and fro whilst pleasing the chained individual.
"Hey Jimbo, hook these chains to your big 'ol super duty hitch and gimme a Hillbilly Dick Tug for me wouldja?"