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You yell 'Nahaa' when you're wrong and you're too lazy to fix it. It's like you're saying 'I'm wrong, but I'm still better than you.'
Nahaa, I didn't forget your birthday. I just forgot you existed.
Nahaa, I didn't cheat. I just got better at lying.
Nahaa, I didn't eat your pizza. I just rearranged it.