1. Spray your slow cooker with non-stick cooking spray.
2. Place pork in slow cooker. Pour root beer over the pork.
3. Cover and cook on low heat for 6-8 hours or until it shreds easily with two forks.
4. Remove pork and shred it using two forks.
5. Drain most of the liquid from slow cooker (keep about 1/2 cup), and return shredded pork to slow cooker and stir in barbecue sauce. Continue heating on low for an additional 30 minutes, until warmed through.
6. Serve on hamburger buns.
Makes 8 servings.