Expressions of disapproval or contempt made by an audience, typically a prolonged 'boo' sound. Also the third-person singular present tense of the verb 'to boo', meaning to make such sounds.
Likely imitative of the sound itself, first recorded in English in the 18th century. The sound may derive from the Latin 'boare' (to cry aloud) or simply be a natural exclamation of disapproval found in many languages.
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