Why do people say OSS in BJJ?

Related questions

1. Why is Brazilian Jiu Jitsu so popular?
2. Is Muay Thai the same as kickboxing?
3. Is Brazilian Jiu Jitsu good cardio?
4. Can BJJ build muscle?
5. What is the difference between Brazilian Jiu Jitsu and regular Jiu Jitsu?
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7. What is the difference between Gracie and Brazilian Jiu Jitsu?
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Tags

1. #onegai
2. #first
3. #invitation
4. #translates
5. #inviting
6. #please
7. #famous
8. #abbreviation
9. #definition
10. #permission
11. #train
12. #origins
13. #shimasu
14. #partner
15. #solicitation
16. #which
17. #request