It is a way of saying "hi" or "hello" but it is much better then both of those words put together. Its "hoi". You can also change the word "bye" into "boi" when you are leaving the conversation. This can be used on facebook or in real life. it cannot be used to replace the word "high", only "hi" and "hello".
Matt: hoi
James: hoi
Matt: wuts good
James: nothing much
Matt: ok boi
James: boi
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Technically the line underscore line is something that you tell somebody when they are being a dumbass
Bob: yo, brandon, wus kickin ma home slice chizzle mcdizzle
Rob: line underscore line (-__-)
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