Fry Sauce: A mixture of ketchup and mayonaise for dipping french fries (Freedom Fries at U.S. Congress Commisary). Created by a regional burger joint, Artic Circle in the 1960 with most locations in Utah and Idaho.
Became a regional mainstay of almost all fast food resturants and home in Utah and Idaho.
Utahn: "I want fry sauce, not ketchup, with my order"
Zitfaced Order Taker in Utah : "Do you want fry sauce with that?"
Out of State Customer: "What? What the hell is fry sauce?"