"Crispy" describes food that you eat. Chicken that is crispy on the outside has skin that is browned, dry, and hard to the touch but easy to bite through. Some other examples of food that is supposed to be crispy are:

• french fries
• bacon
• chips

"Crispy" is almost always a good thing for food. However, sometimes when food is burnt, people will make a joke by calling it "crispy".