A phenomena commonly found in Southern states where a particular woman is both your wife, mother, sister and cousin. Possible in only one scenario, that being your father inseminated his sister, married the child, had you and, upon death, allowed your MSC (mother, sister and cousin) to marry you.
"Dad just died, so Billy-Bob is finally my WMSC."
Person 1: "Dude, what the fuck is up with your family tree?"
Hick: "Oh, thanks to my WMSC, it's more like a family bush"