Why do BJJ guys say OSS?

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Tags

1. #other
2. #arduous
3. #words
4. #determination
5. #second
6. #persevering
7. #means
8. #shinobu
9. #conveys
10. #withstand
11. #never
12. #training
13. #pushed
14. #which
15. #known
16. #definition