It is a mix of lint, pubic hair, and used toilet paper stuck in an unwashed, or dirty vagina. The mixture can get caught in the back of the throat when going down on an unclean vagina. Can cause gagging or choking.

When you eat dirt for the first time and leave your family to build a shack in the woods

You... you wouldn't understand, it's a Jersey thing.

...actually, it refers to the gunk that comes out of a vagina (a muff) , i.e yeast infection or other disgusting things of that nature. It's pronounced Gah-bage so often mistaken for Muff Cabbage.

Any non-orgasmic vaginal discharge

- adjective (Slang: Vulgar.
Muff Cabbage - muhf gahr-bij
1. A term coined by the Jersey Shore which is slang meaning "Moth'a f*cking garbage".