1. Place bacon in a skillet over medium-high heat, and cook until evenly brown. Drain and crumble.
2. Spray a slow cooker with cooking spray. Place turkey in the slow cooker. Season with garlic pepper. In a bowl, mix the bacon, gravy, flour, Worcestershire sauce, and sage. Pour over turkey in the slow cooker.
3. Cover slow cooker, and cook turkey 8 hours on Low.