OSS it's a pretty generic term derived from Japanese martial arts. It is a particularly enthusiastic way of saying “yes” or to acknowledge something or someone, similar to the U.S. Marines when we say “OOH-RAH”.
The famous “OSS” has many origins. The first definition of “OSS” as an abbreviation for Onegai Shimasu, which translates into a request, a solicitation, an invitation like “please”, “if you may” or “with your permission”, much used when inviting a partner to train.
Sensei: Are you ready?
Kouhais: OSS!
Oh Shit Scenario. When someone runs into an unfavourable scenario that is difficult or complicated to resolve.
Speaker 1: Uggh! I lost all the files for my presentation in two minutes, I don't know what to do!
Speaker 2: Sounds like you've run into an OSS.
Speaker 1: After failing to pay his debts for the last three years, the bank has him in a bit of an OSS.
Yo!!! I was in Tabu last night and that cougar was OSS.... she put my girl to shame.
OSS (One-Sided syndrome) is a type of heartbreak syndrome that is happening to people in their teens. OSS "simp"-tomps are the following: ghosted, coldness, simpness, deja vu, jealousy, and the worst conditions: blocking, crying, blinded, and bare minimum disease (BMD). Transmission is through eye contact with someone who have the syndrome and is untreatable.
*ghosted for 5 minutes*
*consulted a doctor*
Doc, I'm ghosted for 5 minutes.
You have OSS, my dear.
An "oh-shit situation". Situation in which you are unable to answer due to unforseen predicaments.
A: Hey man, what you up to?
B: oss
*long pause*
B: sry, pulled too many mobs, couldnt type