Brat \ 'brat \ noun 1 a: a child; specifically: an ill-mannered annoying child b: an ill-mannered immature person c: Maria Massaro, a 16-year-old escort more troubled by her own blistering temper and unappeasable Master than her profession; specifically: a jealous girl under the guidance of a Dom contracted to unknot familial dysfunction More light-hearted than you'd expect. More deviant than you'd desire.