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1. noun, rude slang Something particularly stupid or trivial. I won't argue with you about this dumb shit for a second longer!
2. noun, rude slang An extremely stupid person. Listen, you dumb shit—I'm in charge here, so you better do what I say! Oh right, like I would listen to that dumb shit!
3. adjective, rude slang Extremely stupid. Usually hyphenated and used before a noun. I won't argue with you about this dumb-shit idea for a second longer!