Trim excess fat from venison. In large bowl mix beer, garlic, salt, pepper, onions and bay leaves; add venison. (Marinade should cover meat) Marinate in refrigerator for 12 - 24 hours, turning occasionally.
Remove venison and onions from marinade and place in slow cooker/Crock pot. Pour 1 cup Barbecue Sauce over top. Cover and cook on low for 10 - 12 hours. Serve with remaining Barbecue Sauce.
Servings: 4 to 6