Two known definitions:
1. Just how it sounds-- testicles that are far from well-kept.
2. A delicious British snack, typically cornmeal formed into a ball-form, tossed and coated in a honey glaze.
1. Man, that dude had some sloppy balls. They were dirty, sweaty, and some parts had long pubes while others were completely shaved.
2. Yes, waiter, I'll have an order of the sloppy balls please.