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kys is a term that five-year-olds or pissed off teenagers trying to be better than whoever they are arguing with online use to tell the opposite side to end thier life. The K stands for Kill, the Y stands for your, and the S stands for self. Many people who can't think of a way to have a comeback will act as if they think kys stands for Keep Yourself Safe, even though they very clearly know it truly is someone wishing suicide upon them.
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