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Onshe (Also pronounced Onsh) is a slang term for a male that is currently in the process of transitioning to female. They are obviously huge advocates for transgender rights and being called an "Onshe" is like a badge of honor for trans people.

The word can also be used as a verb - replacing the word "transitioning" when speaking of gender reassignment surgery.
Mary: "Hey did you see that powerful Onshe getting her first COVID vaccine shot?"
Tim: "I did - She's extremely brave for transitioning and smart for receiving the vaccine."

Tom: "Greg! It's great to see you again. I haven't seen you since high school - what have you been up to?"
Greg: "I'm actually in the process of onshing right now. This time next month I'll finally be the woman I always dreamed of"
Onshe by MaskUp69 April 9, 2021
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An onsen is a Japanese style public bath using volcanically heated hot water from the ground.

The term onsen is often used in the Japanese language in reference to the bathing facilities surrounding hot springs.

Onsen, when translated into English means 'hot spring', which can lead to confusion and miscommunication.
After watching the monkeys in the hot spring, do you want to go to an onsen?
Onsen by 7 years in August 20, 2013
Related Words
Onshe Onshel oishee oshea Onset Osher ohshen onche Onehead Onsel

Public Obsheenity 

Getting caught in public with drugs, booze, hookers, and porn stars.
Man, I miss Vegas. You could walk down the street doing whatever you want and never get charged with Public Obsheenity.

Sudden Onset Autism 

Sudden Onset Autism, or S.O.A for short, is an extremely rare condition of unknown origin. Development of this disease is both abrupt and severe. As of now, the pathogenesis and mode of infection have eluded even the most qualified of research teams at Harvard, Hopkins, and Yale. Some have suspected that transmission occurs through contact with an infected person, especially prandially. There is still hope for a cure, although we may be decades away.
Infected Person: Hey man, let's go grab some lunch
Healthy Individual: what?! It's 3 in the morning. What's wrong with you
Infected Person: Well... it's lunchtime somewhere!
Healthy Individual: Oh God, you have Sudden Onset Autism... Please go away from me!
A small town not that far from the Michigan International Speedway. Has a school populated with the worst drug problem in the district. It is overall a nice town and is an enjoyable 15 minute walk.
Boy: where do you live?

Girl: Onsted, Michigan.

Boy: Where The F*** is that?!?
Onsted by Avalare October 10, 2011
A Nigerian term used when you agree with something or you think something is really cool or makes sense. The last letter can be lengthened to show higher degree of coolness.
E.G: TMZ: Amber Rose's sex tape out now
Wiz Khalifa: Osheyyyy...
or
Kanye: Scott, Kim K now gives free bj's
Scott: Osheyyyyy.. correct girl
Oshey by TheNigerianDictionary March 8, 2015
a. Having a low temperature.
b. Feeling a sudden drop in tempature
c. Feeling no warmth; uncomfortably chilled.
* More commonly used in the South.*
Person A: Do I need to wear a jacket?
Person B: Well it's pretty ooshee out there.
Ooshee by COCKYgirl18 November 16, 2011