Definitions of boo
  1. verb
    show displeasure, as after a performance or speech
    synonyms: hiss
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    acclaim, applaud, clap, spat
    clap one's hands or shout after performances to indicate approval
    type of:
    declare or judge unfit for use or habitation
  2. noun
    a cry or noise made to express displeasure or contempt
    synonyms: Bronx cheer, bird, hiss, hoot, raspberry, razz, razzing, snort
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    type of:
    call, cry, outcry, shout, vociferation, yell
    a loud utterance; often in protest or opposition
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