huh

interjection

1. (with falling pitch) used to express amusement or subtle surprise.

- Huh! I'm sure I locked it when I left.

2. Used to express doubt or confusion.

- Huh? Where did they go?

3. (with rising pitch) Used to reinforce a question.

- Where were you last night? Huh?

4. (Discuss(+) this sense) (slang, with falling pitch) Used either to belittle the issuer of a statement/question, or sarcastically to indicate utter agreement, and that the statement being responded to is an extreme understatement. The intonation is changed to distinguish between the two meanings - implied dullness for belittlement, and feigned surprise for utter agreement.

5. (informal, with rising pitch) Used to indicate that one did not hear what was said.

- Huh? Could you speak up?

6. (informal, with falling pitch) Used to create a tag question.

- It's getting kind of late, huh?