Scumbag/ˈskʌmbæɡ/ Definition 1 of 2Pro Tip 1/3Negative Connotation Carries strong disapproval when describing someone's behavior or character. After cheating in the exam, he was labeled a scumbag. Pro Tip 2/3Informal Insult Used in casual conversations, often as an insult, not polite or formal. He's such a scumbag for lying to everyone. Pro Tip 3/3Intensively Emotive Expresses strong negative emotions towards someone. She felt betrayed and called him a scumbag.