<p><strong>Verb (used without object)</strong></p><ul><li>to cry out or shout, especially in disapproval or derision.</li><li>to utter the cry characteristic of an owl.</li><li>to utter a similar sound.</li><li>Chiefly British: to blow a horn or whistle; toot.</li></ul><p><strong>Verb (used with object)</strong></p><ul><li>to assail with shouts of disapproval or derision: The fans hooted the umpire.</li><li>to express in hoots: The crowd hooted its disagreement with the speaker.</li></ul><p><strong>Noun</strong></p><ul><li>the cry of an owl.</li><li>any similar sound, as an inarticulate shout.</li><li>a cry or shout, especially of disapproval or derision.</li><li>British: a horn, siren, or whistle, especially a factory whistle.</li><li>Informal: the least bit of concern, interest, or thought; trifle: His religion doesn't matter a hoot to me.</li><li>Slang: an extremely funny person, situation, or event: Your cousin is such a hoot!</li></ul>