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!"
by Notayler September 13, 2020
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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!
by Cruby September 14, 2020
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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.
by DeepJ January 2, 2022
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