Prepare dry rub. Combine spices in a ramekin. Thoroughly coat rib tips in the seasoning. Let sit for 15 minutes.
Add ribs to the slow cooker. **You may choose to cut the ribs prior to this if desired. We have done it both ways and it did not make much of a difference**
In a small mixing bowl, combine root beer, bbq sauce, and Worcestershire sauce. Whisk until smooth. Set aside ⅓ cup of sauce, then pour the remainder over the ribs. Cover and cook on low for 5 hours.
Remove ribs from the slow cooker and place on a wire rack lined baking sheet. Brush with the reserved bbq sauce. Place 6” under the broiler and broil for 4 minutes.
Arrange ribs on a platter and garnish with green onions. Enjoy!