What is the meaning of Hah?

Alternative form of ha.

Alternative form of huh.

Alternative form of heh (“Semitic letter”).

Synonym of ah (sense 1); used to form tag questions prompting the listener to confirm something.

Used to form a tag question, either to invite acknowledgment, or to ascertain the continued attention of the listener.

Tagged at the end of a confirmation-seeking sentence to express subtle surprise or realisation.

Huh!; used to express subtle surprise or amusement in a conversation.

Expression of discontent when one is faced with a rude awakening.

Used to reinforce a question: eh?

Source: wiktionary.org

See also