Buy One Burger, Get One FREE! Online coupon Code: MOOBOGO. In- Restaurant: 218723. Valid only at the KNOXVILLE Locations. Buy One burger, Get one Free of equal or lesser value. Not valid on Kids Meals, Salad or Hot Dogs. Cannot be combined with any other discounts, Coupons, Promotions or MOOyah Rewards. Limit one coupon per party, per visit. No cash value. Expires 1/21/22. 2021 Mooyah Franchising, LLC. 1/21/22