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You yell this when someone tells you they did something so bad it makes your brain short circuit.
You: 'You stole my lunch?' Them: 'I ate it.' You: 'O. N. Y. D oh no you didn't!'
Your friend says they failed their math test. You scream 'O. N. Y. D oh no you didn't!' because you're still passing.
Your mom says she threw your brother out of the house. You: 'O. N. Y. D oh no you didn't!'