What is the meaning of saish?

"Saish" is not a common word in any major language. It's possible you might be misspelling a word, or it could be a regional slang term.

To help me understand what you're looking for, could you provide more context?

For example:

* Where did you encounter this word? (e.g., in a book, a song, a conversation)

* What was the surrounding text or conversation?

* What do you think the word might mean?

With more information, I can give you a more accurate answer.