ANSWERS: 4
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Perhaps the answer you seek is this short video. http://www.youtube.com/watch?v=7n9agTduQ4M
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12-06-2016 Oddly, martial artists actually study such things. "Kiai" is a big deal in some schools, and the teachers have noticed that the exact sound depends on nationality. The Japanese mouth tends to make a noise something like "eh-ee" while the American mouth tends to sound more like "heeyaw" or "hooey". But as for "hey", every language I have looked at has that exact sound and they all mean the same thing.
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A dialect variation, I should imagine.
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the same way YO came about..It was slang way back when.
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