Smashburger Restaurant Coupon: Any Burger or Big Dog B1G1 Free (Valid Through 1/23/26)

Smashburger offers Buy One Burger or Big Dog, Get One Free when you apply coupon code CHEESEME at checkout online or via mobile app (iOS or Android) through January 23, 2026. You may also try presenting the coupon code at the register in-store during checkout. Select free in-restaurant pickup to save on any additional fees.