1. Expression of surprise or disbelief: "Chu?" can be used to express surprise or disbelief in a similar way to "huh?" or "what?".
2. Asking for clarification: "Chu?" can also be used to ask for clarification or to indicate that you did not understand something.
3. Imitating the sound of a kiss: In some contexts, "chu" may be used to imitate the sound of a kiss.
4. As an abbreviation: In some cases, "chu" may be used as an abbreviation for various words or phrases, such as "church" or "check it out".
5. As a name: In some cultures, "chu" may be used as a name or nickname for a person.
6. In Chinese: In Mandarin Chinese, "chu" (出) is a common verb that means "to go out" or "to leave".
Without more context, it is difficult to determine the exact meaning of "chu" in a specific situation.