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. (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.

   "(agreement) A: "Murder is bad." B: "Huh!""

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

   "Huh? Could you speak up?"