 This is a chip. Delicious. But why would someone have a chip on their shoulder? Dan, do you have any idea why Craig is mad at me? He's just got a chip on his shoulder. It still bothers him that you got that promotion instead of him. That was months ago. He needs to get over it. I agree. If someone has a chip on their shoulder, they feel angry about a past situation. They hold onto the belief that they were treated unfairly. This makes them generally unpleasant to be around.