The term brat is used in numerous expressions in which the term denotes a stubborn or spoiled attitude. As an example: Dont be a brat share your toys, is what a parent may say to a naughty child. The other one is, she was a brat when things did not go her way. In a light-hearted situation, a person may say something in jest, You are such a brat! You ate my dessert. These illustrate the serious and light application of these words and therefore, how the meaning can change with the tone and purpose.