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I've heard that theory before, but I think it came after the word was first recorded.
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Wasn't that from the Plague or something back in Europe times?
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Never heard of that one! Here's the one I know: #1587542
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Wow... you've sent me on a mission, hahaha
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This is the origin I recall hearing.
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The one I know is that people used to put "0 Kill" outside their houses, and then it was left as "0K," and from there came OK.