Tennessee Moonlight
The activity of a redneck male inserting a glow stick into his urethra, then fucking his relative in the ass. When he finishes, the glow stick will now be glowing out of her/his asshole.
Hick 1: "Hey Cleetus did ya hear that Billy made a Tennessee Moonlight with his sister?"
Hick 2: "That had to light up the entire rodeo!"
Hick 2: "That had to light up the entire rodeo!"