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Fachoina is like a rude shout you use to grab someone's attention or make them feel stupid. It can be used for greetings, insults, or just because you're in a bad mood.
Fachoina! Did you forget your brain again?
Fachoina! I'm going to eat your lunch if you don't shut up.
Fachoina! I just failed my math test, and it's all your fault.