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A naahy is a stupid person who thinks they're smarter than you and always tries to fix your words even when they're fine.
You say 'I ain't got no time' and they say 'You should say I don't have any time.'
You post a tweet: 'This dog is so cute.' They reply: 'You should say this dog is extremely cute.'
You say 'I'm gonna go eat.' They say, 'You should say I am going to eat.'