It can have slightly different meanings depending on the context:
* As a question: "What you want?" can ask someone to express their desires or preferences.
* As a statement: "What you want" can imply that the speaker is giving the other person the freedom to choose or do what they please.
It's important to note that WYWH is a slang term and may not be understood by everyone. If you're unsure whether someone will understand what you mean, it's always best to use clearer language.