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A dadum is the worst human being ever. They fail at life, look like a soggy taco, and cry at the slightest insult. They eat lunch alone like they just got dumped by the whole school.
My cousin is a dadum. He failed math and still wears a hat inside.
That kid in the back who cries every time someone laughs at him is a dadum.
My mom says I'm a dadum because I spilled soup on my shirt and cried.