Ossan 

Japanese for middle aged man (40+)

Boy- Ossan, what time is it?
Man- 4:30 and I'm nii-chan, I'm only 24

Ossan by King of The Pirates April 11, 2010

Osmanthus Wine 

Osmanthus Wine is, pretty self explanatorily, a type of wine made out of osmanthus, a plant that grows on the form of shrubs or small trees (mainly on Asia).

Commonly used as a joke between Genshin Impact players, as it is part of a voiceline repetitively said by the character Zhongli;

“Osmanthus wine tastes the same as I remember, but where are those who share the memory?”

Nobody knows what the memory is, now who are “those who share it”.

Person A: “I finally drank Osmanthus Wine after so long.”
Person B: “Does it taste the same as you remembered?”
Person A: “Yes, but where are those who share the memory?”

Osmanthus Wine by Thebringerofwordsiguess August 28, 2021

Osananajimi 

A commonly-used term in romantic anime, an osananajimi is a friend from infancy, a childhood friend or old playmate with whom one shares the special and intimate understanding that (according to such stories) can only come from having known each other since earliest childhood.

A good example of Osananajimi is Manami Tamura from Ore no imouto

Osananajimi by Edgar4815 November 9, 2010

Ovuvuevuevue onyetenyevwe ugwemubwem ossas 

It has been made famous due to an African actor having this as a name. A reporter interviewed this actor and then the interview got published on the internet.

Though this has been made a meme or been given the title "Longest name" or "Hardest name" it does have a meaning.
The real meaning or translation behind this hysterically long name is simply "God is great" but translated word for word it means "All na for God" implying that God is above all.

Reporter: Tell me your name, your name.
African actor: Ovuvuevuevue onyetenyevwe ugwemubwem ossas.

Ovuvuevuevue onyetenyevwe ugwemubwem ossas by x3Golden July 8, 2021

osmanthus wine 

tastes the same as i remember

But where are those who share the memory

osmanthus wine tastes the same as i remember…

osmanthus wine by Kvlluazz August 21, 2021

Oksana 

Majestic soul, Star light

At first glance, you may think that Oksana is an ordinary person, but if you look closely, you will see how unique she is. It's not just a beautiful appearance (charming smile, beautiful hair and graceful body), it's something much deeper - the aesthetics of the soul. Her imagination strikes with its unpredictability, her mind like a sharp sword, her strength of will and courage would be envied by the bravest warriors. Oksana's second name is freedom. It is impossible to describe in words her unique sense of humor, bold sincerity, tenderness, all-encompassing kindness. Looking into Oksana's eyes, you will see not just a blue ocean, a green field, a silver moon or a honeycomb of the sun, but a boundless universe. At times, she may seem as cold as age-old ice and as impregnable as the Pentagon, but you may simply not have seen her sweet shyness. If you fall in love with Oksana, then know that it is a gift of fate, because you have found a magical source of inspiration and unconditional love.

Oksana by fantastic_world May 6, 2020

Oshane 

Oshane is an amazing person. He is funny, adorable, smart, athletic and has an amazing personality.
Oshane annoys the people he loves and if you have an oshane in your life make sure you never lose him.
Oshane may be difficult at times but he will come around. Get yourself an oshane.

Oshane is an amazing athlete.

Oshane by Get urself a me January 2, 2020