1Spray 3 1/2- to 4-quart slow cooker with cooking spray. Remove fat from pork. Rub jerk seasoning over pork; sprinkle with thyme. Place pork in slow cooker. Sprinkle with onion. Pour cola over pork.
2Cover; cook on Low heat setting 8 to 10 hours.
3Remove pork from slow cooker; reserve 1/2 cup juices. Use 2 forks to pull pork into shreds. Place pork in slow cooker. Stir in barbecue sauce and reserved juices. Increase heat setting to High. Cover; cook 30 to 45 minutes or until thoroughly heated. Spoon filling onto buns.