A spitfire is a person, especially a woman, who has a fierce and fiery temper.
The word 'spitfire' can have a negative connotation, meaning the person might be seen as difficult or hot-tempered.
Examples:
My grandma is a spitfire when she's angry.
The girl at school is a real spitfire.
The spitfire yelled at the man.
Watch out for the spitfire, she's on fire today!
The little girl is a spitfire when she doesn't get her way.
The spitfire boss scared everyone at work.