Haw

1. An imitation of laughter, often used to express scorn or disbelief. Often doubled or tripled (haw haw or haw haw haw).
2. An intermission or hesitation of speech, with a sound somewhat like "haw"; the sound so made.

Usage notes

• (an imitation of laughter): In the US, haw is rare (it was more used in the past), with ha being more common.