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A person who is both an idiot and a smelly, brainless, self-centered piece of garbage. They do stupid stuff just to make people look at them.
My neighbor is a jackbag. He threw a sandwich at a dog and yelled at it for eating it.
My teacher called my friend a jackbag because he tried to cheat on a pop quiz.
My cousin is a jackbag. He tried to flirt with my dog and got bit.