A one syllable laugh like "heh" or "hah" that in most cases is used when following a simple statement or comment that is somewhat humorous. Can also be used as a courtesy laugh.
Dude One: "Jebus man, my shoe is tied all funny."
Dude Two: "hah"
Dude One: "Thanks for the gigglet."
Dude Two: "Of course... heh."