Here are some possible interpretations:
* "What you" - This is the most common meaning, used as a direct question like "What do you...?" or "What are you...?"
* "That you" - This is a more specific interpretation, often used in conjunction with a verb. For example, "Que tu leas" (That you read) or "Que tu hagas" (That you do).
* "So you" - This can be used to express a consequence or result of an action.
To understand the exact meaning of "que tu," you need to look at the entire sentence and its context.
Can you give me the full sentence where you encountered "que tu"? That way I can help you understand its meaning more accurately.