A chuckwagon is kind of like a kitchen on wheels that cowboys used a long time ago. When cowboys were out on the range taking care of all their cattle, they needed to eat and they needed someone to cook for them. That's where the chuckwagon comes in!
The chuckwagon was a big, sturdy wagon that could hold all the supplies needed for cooking and eating. The cowboy cook would load up the wagon with food, utensils, pots and pans, and a stove. Then, the chuckwagon would be pulled along by horses to wherever the cowboys were working.
When it was time to eat, the cowboy cook would get to work in the chuckwagon. He could make all kinds of yummy foods like roasted meat, cornbread, beans, and stew. The cowboys would gather around the wagon and eat off of tin plates and drink coffee or tea from tin cups.
So that's what a chuckwagon is! It's like a big kitchen on wheels that cowboys used a long time ago to make and eat their meals while taking care of their cattle.