Slugburger
A slugburger is a traditional Southern food found in the area of Northeast Mississippi, particularly Corinth, New Albany, Booneville, Iuka, Tishomingo, Burnsville, West Tennessee, and north Alabama, particularly Decatur, Hartselle, Athens, Moulton, and Cullman. Consisting of a patty made from a mixture of beef or pork and an inexpensive meat extender such as soybeans, it is deep fried in oil. It is typically served on a bun with mustard, pickles, onion, and in some places with a side of French fries or onion rings. John Weeks brought his hamburger recipe from Chicago to Corinth in 1917. Weeks had local butchers grind his hamburger meat to specification, asking them to include potato flakes and flour. These small hamburgers were originally called Weeksburgers. Sometime before 1950, soy grits replaced the potato and flour and has remained the primary extender. According to town legend, the term "slugburger" comes from the slang term for a metal disk the size of a nickel that would work in vending machines.
Source: Wikipedia