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A person so full of themselves that they think they're the best thing since sliced bread, and they probably took the bread and the knife and the toaster and called them all friends.
My cousin is a D00sh. He thinks he's a rockstar just because he knows how to send a text.
My boss is a D00sh. He yells at the printer when it doesn't work.
My neighbor is a D00sh. He thinks he's the president just because he has a fake ID.