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Kaixo is the Basque way of saying 'hello', like if your grandma woke up and yelled it at you.
My cousin texted me 'kaixo' at 3 AM. I thought my dog was dying.
My teacher said 'kaixo' instead of 'good morning.' I didn't know what to do.
I walked into a bar and said 'kaixo.' The bartender gave me a look like I had just insulted his mom.