 Brazilian Jiu-Jitsu (BJJ) is full of unique terms that build community and culture. One of the most common—and misunderstood—is “OSS” (sometimes spelled “OSU”). If you’ve trained for any time, you’ve probably heard it shouted across the mats. But what does OSS really mean in BJJ, and when should you use it?
Let’s break it down as decisions so you can understand the origins, proper usage, and how it impacts your training experience.
What Does OSS Mean in BJJ?
Use OSS when you want to show respect, acknowledge instruction, or encourage training partners.
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The term comes from Japanese martial arts and carries multiple layers:
- Onegai Shimasu → a polite request, often translated as “please” or “I humbly request.”
- Oshi Shinobu → meaning “persevere when pushed” or “endure under pressure.”
In practice, OSS combines these concepts into a short, powerful expression of respect, discipline, and resilience.
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Where Did OSS Come From?
Recognize OSS as a borrowed cultural expression, not originally from Brazil.
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Origins:
- Rooted in Japanese martial arts like Judo, Karate, and Kyokushin.
- Brought into BJJ by Grandmaster Carlson Gracie Sr., who adopted it as a respectful nod to Japanese traditions.
- Similar in spirit to the U.S. Marines’ battle cry “OOH-RAH.”
How Do BJJ Practitioners Use OSS?
Use OSS intentionally, not casually.
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In Training:
- At the start and end of class → students bow and say OSS to show respect.
- When receiving instructions → saying OSS confirms you’ve understood.
- As encouragement → you can say OSS to motivate teammates during hard rolls.
Think of it as a Swiss Army knife for communication in BJJ—respect, confirmation, and encouragement packed into one word.
When Should You NOT Use OSS?
Avoid using OSS outside martial arts culture.
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Why:
- Not everyone understands it, so it may confuse or even feel awkward in casual conversation.
It works best inside gyms, competitions, and martial arts environments, where everyone shares the same cultural understanding.
Also read:Â Guide to BJJ Weight Classes
Why Does OSS Matter in BJJ Culture?
Embrace OSS if you want to connect deeply with the BJJ community.
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Impact:
- Reinforces values like respect, perseverance, humility, and mental toughness.
- Acts as a shorthand way to say: “I understand, I respect, I’m ready, and I won’t give up.”
Builds a sense of team unity—whether you’re a white belt or a black belt.
Also read:Â How to get Black Belt in BJJ (From Blue to Black Belt explained)
Looking to learn more about BJJ?
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With any luck, this knowledge has assisted you better understand what OSS is and where it came from.
FAQs About OSS in BJJ
Q: Is OSS the same as OSU?
A: Yes, they’re the same word, just different spellings.
Q: Do I have to say OSS in class?
A: No—it’s not mandatory. But using it shows respect for the culture and instructors.
Q: Can OSS be used outside BJJ?
A: Only if you’re in another martial arts setting (Karate, Judo, etc.). Outside of that, it’s usually out of place.
Q: Why do some instructors not use OSS?
A: Some prefer to stick to Portuguese greetings like “Obrigado” (thank you) to emphasize Brazilian roots instead of Japanese influence.
