chuck wagon

Short definition from Wiktionary

Noun

1. 1
   A wagon equipped with food and cooking utensils, and used to prepare meals, as on a ranch, in a lumber camp, or during a cattle drive in the latter part of the 19th century.
2. 2
   A sandwich composed of a piece of chicken-fried steak or a breaded beef patty, with typical toppings being lettuce, tomato, and mayonnaise.