Merriam-Webster Collegiate Dictionary - hoot

 I. verb  Etymology: Middle English houten, of imitative origin  Date: 13th century  intransitive verb  1. to shout or laugh usually derisively  2. to make the natural throat noise of an owl or a similar cry  3. to make a loud clamorous mechanical sound  transitive verb  1. to assail or drive out by ~ing ~ed down the speaker  2. to express or utter with ~s ~ed their disapproval  II. noun  Date: 15th century  1. a sound of ~ing; especially the cry of an owl  2. a minimum amount or degree ; the least bit don't give a ~  3. something or someone amusing the play is a real ~  • ~y adjective  III. interjection  or ~s  Etymology: origin unknown  Date: 1540 chiefly Scottish — used to express impatience, dissatisfaction, or objection