It's possible that:
* It's a misspelling: It might be a misspelling of a similar-sounding word, like "she's a," "she is a," or "she's".
* It's a slang term: It could be a slang term or a nickname used in a specific community or region.
* It's a made-up word: It's possible that the word was created for a specific context, like in a fictional story or game.
To understand the meaning of "sheeza," you'll need more context. Please provide more information, such as the sentence where you found it, the situation in which it was used, or any other clues you have.