From Longman Dictionary of Contemporary Englishbooboo1 /buː/ verb [intransitive, transitive] DISAPPROVEto shout ‘boo’ to show that you do not like a person, performance, idea etc Some of the audience started booing. She was booed off stage (=they shouted ‘boo’ until she left the stage).→ See Verb table
Examples from the Corpus
boo• Half the crowd cheered, the others booed.• Many Republicans hissed and some booed.• I was booing and hissing the bad guys with the best of them, and I usually hate audience participation.• He was booed and jeered by 16,000 spectators for not walking promptly after giving a desperately hard-to-judge return catch.• Taylor was booed as he left the field.• And the fans who booed him in the ring were drawn to him outside it.• And still they boo if the mood takes them.• You can almost hear them booed in tandem by the Giants' irate fans.• Linfield fans booed their team off the pitch and applauded Bangor.• Some people in the crowd booed when she walked on stage.booboo2 interjection 1 DISAPPROVEa noise made by people who do not like a person, performance, idea etc2 FRIGHTENEDa word you shout suddenly to someone as a joke in order to frighten them3 → wouldn’t say boo to a gooseOrigin boo2 (1800-1900) Natural sound 