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comeback sauce

n. A dipping sauce and salad dressing of central Mississippi, typically based on mayonnaise and chili sauce.

Wikipedia
Comeback sauce

Comeback sauce (sometimes spelled kumback or cumback) is a dipping sauce for fried foods or as a salad dressing in the cuisine of central Mississippi.Similar to Louisiana remoulade, the base of the sauce consists of mayonnaise and chili sauce (or some approximation of that combination). The origin has been credited to The Rotisserie, a Greek restaurant that was located in Jackson, Mississippi.

Several Jackson, Mississippi, restaurants serve their own variations of the sauce and many offer bottled comeback sauce.