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Smashburger is offering a buy-one-get-one-free deal on burgers and Big Dogs using promo code "SEPBOGO26" online, or by mentioning the offer at checkout in-restaurant. The free item must be of equal or lesser value, and the deal excludes the Smoked Brisket Bacon Smash and crispy chicken items. The offer runs from September 28 through October 3, 2026 at participating US locations. Shop Now at SmashBurger
