A Brat is a person who identifies as a submissive or bottom in the BDSM community. They are defiant, misbehave and will test the patience of their Dominant through words and actions. A Brat will talk back, throw tantrums and be stubborn just so they can achieve their goal of getting all the attention from their Dominant and being disciplined by their Top. The ultimate gratification is eventually giving in to the desires and will of their Top.
They are motivated by various things such as the desire and need for attention. They need to build a trust relationship and they crave punishment and discipline. A Dominant or Top that has a Brat is sometimes referred to as 'Brat-Tamer'.