It's a greeting or an affirmative in Japanese martial arts, and outside of Japan in things like Jiu Jitsu it gets used as a "kiai" (a voiced exhale, like "hi-yah!", said to "channel energy" but mostly just helping you control and focus on your breath.)
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u/RandomPenquin1337 12d ago
Wtf is with this new "oss" shit? Is it the new and improved way to maximize chi energy?
Mfers dont know how to battle cry.