Define snack

As soon as she gets home from school, Brooke's friend calls.
Friend: What are you doing?
Brooke: Having a snack.
Friend: Me too. What are you having?
Brooke: Fried chicken.
Friend: FRIED CHICKEN?!!! I'm just a having a little piece of cake!

My point in sharing? I don't really know if there is one but listening to this conversation was hysterical.