Definition of boo verb from the Oxford Advanced American Dictionary

 

boo

 verb
verb
NAmE//bu//
 
[intransitive, transitive]Verb Forms present simple I / you / we / they boo
 
he / she / it boos
 
past simple booed
 
-ing form booing
 
 
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to show that you do not like a person, performance, idea, etc. by shouting Boo! The audience booed as she started her speech. boo somebody He was booed off the stage.
See the Oxford Advanced Learner's Dictionary entry: boo