Okay kiddo, so a chili burger is a type of food that has a burger patty (which is made from meat) and chili (which is a type of stew that has meat and beans and spices) on top of it.
It's like having a yummy burger with extra toppings. The chili makes the burger extra tasty and gives it a little kick of spice.
Sometimes people put cheese, onions, and other toppings on their chili burger too, to make it even more delicious.
It's like having a fun party in your mouth where all the flavors come together to make you really happy!