A vagina that has been stained orange and/or yellow from tobacco spit and nicotine.
That girl has slept with so many rednecks that she probably has a rusty waffle.
When a person lays on their side, defecates on their own leg and then squeezes it between their thighs into a patty similar to a waffle.
This dude asked if I liked mud pies, then proceeded to demonstrate a Rusty Waffle Maker.