What is Chip On His Shoulder?
1.
"Chip on his shoulder" commonly refers to someone who has a self-righteous feeling of inferiority or a grudge. An example would be someone always bringing up how they are or were disadvantaged in some way.
Person 1:"I was raised in a working class family with no luxuries"
Person 2:"But now you're a millionaire..."
Person 3:"Don't worry about him mate, he's just got a chip on his shoulder."
See