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清楚 or せいそ
Meaning clean, tidy in Japanese.

Have been adopted by VTubers to mean Wholesome. Seems to be used ironically in many instances.
"She's a psychopath!"

"What do you mean? She's totally seiso!"
Seiso by Notayler September 12, 2020
Related Words
1.If you see it, then you believe it.

2.Seeism is the simple idea that nothing
exist without visual confirmation.
I don't believe that John kissed Mary. In this case, I am a firm seeist. I'd have to see it to believe it.
Humans have been practicing Seeism ever since they opened their eyes.
Seeism is the oldest form of confirmation.
Seeism is practiced by every living thing, with eyes.
Seeism by Seeist April 19, 2009
A Japanese word which describes someone with a pure and clean image. This word would typically be used to portray the ideal Japanese beauty or an idol. Seiso can also imply a sense of wholesomeness.
Matsuri can be really seiso at times even though she’s a lolicon...

Nyanners is totally seiso, she is the most pure angel ever who would never ever steal your wife!
Seiso by Cruby September 14, 2020
Seiso is a Japanese word that is used to describe a woman's character and appearance.

In a general sense, it means a woman who has a humble character, a clean appearance, uses beautiful words, and has beautiful posture and movements.
On the other hand, in the case of neatness used in the context of Vtuver, the meaning is slightly different.
Specifically, it adds not being lewd to its original meaning.
Seiso: When a lewd topic comes up, she doesn't like it. She skillfully changes the topic to the next one or is embarrassed.
Not Seiso: When a lewd topic comes up, she actively uses it to entertain and enliven the audience.

Seiso: She does not raise lewd topics. She will ignore or scold viewer comments when they are made on such topics.
Not Seiso: She may raise lewd topics to entertain viewers and herself.
Seiso by DeepJ January 1, 2022

semisocialize 

To attend a large gathering of people where mingling with strangers is encouraged (e.g., a party or bar) but converse only with the small handful of people one arrived with.
"Those parties are bullshit for meeting people. Everyone just shows up and semisocializes in their own little cliques."

"The guy throwing that party might be douchey, but let's go anyway. We can drink his booze and semisocialize."

Sexisode 

Sex webisode; online tv sex episode.
He banged her hard in that sexisode.
Sexisode by iAnonymous March 20, 2008