<p><strong>Noun</strong></p><ul><li>Informal. a person who breaks up something: crime busters.</li><li>something that is very big or unusual for its kind.</li><li>a loud, uproarious reveler.</li><li>a frolic; spree.</li><li>(initial capital letter) (used as a familiar term of address to a man or boy who is an object to the speaker's annoyance or anger): Look, Buster, you're standing in my way!</li></ul>