What language is the greeting czeso?

"Czeso" is not a standard greeting in any widely spoken language. It's likely a misspelling or a made-up word.

Here are some possible scenarios:

* Misspelling: It might be a misspelling of "cześć" which is the Polish word for "hello" or "hi."

* Regional variation: It's possible that "czeso" is a regional or informal variation of a greeting in a particular language or dialect.

* Made-up word: It could be a fictional greeting invented for a story or game.

Without more context, it's impossible to determine the intended language.