Namely a fat gap toothed hick with a bad dye job. Also can be seen at night around bingos and bars looking for a man to have a good time with before going home to wallow in her filth. Also known as a vicki.
Girl at bar: Ew look at that Ditch Pig going home with that Robert Other girl at bar: Why in the world is he with her ?
First Girl at bar: I dont know but he is obviously blind !
In contrast to a gutter slut... high heels, miniskirt, smeared makeup, and a martini glass. A ditch slut would have jeans, tshirt, no teeth, beer can, and be barefoot.