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The oldest known definition that precedes all these Millennial driven meanings is that of, "Yes, I understand" which has it's roots in martial arts training or history of the GoJu Ryu. That is the deepest most meaningful meaning. However, it also expands over a broader range to mean, "I see. I acknowledge." Eg. Someone shows you how to do something. Oos! And is said in thankful tone. You can approach someone right after graduation. Oooos! Said with excitement. You can be reprimanded about something. Oos. Said with an I'm sorry attitude. There is a whole yin-yang aspect to it. Can be soft, hard, or however it needs to conform to the scenario.
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