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I recognize that it's another way of saying "good night," where does it come from?

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Are you sure this is a dialect thing? Did you hear it out loud? I'm just asking because I've got a Japanese friend who uses this on chat just for fun (just playing with the sounds). – Ash Feb 8 '14 at 4:37

「おやすも」 is used only by some residents of the region named インターネット. It is not used in Tokyo or Nagoya, I promise.

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