I think that this is a pretty standard recipe. On the East coast, anyway.
2 lbs. frozen beef or turkey meatballs
12 oz. chili sauce
12-18 oz. grape jelly (some people prefer it sweeter than others)
Pour meatballs into a slow cooker. Top with chili sauce and jelly. Cook on low until meatballs are heated through, 3-5 hours, stirring occasionally.