huh

interjection

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

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

• Used to express doubt or confusion.

  "Huh? Where did they go?"

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

  "Where were you last night? Huh?"

• (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!""

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

  "Huh? Could you speak up?"

• (with falling pitch) Used to create a tag question.

  "It's getting kind of late, huh?"