Definition of boo verb from the Oxford Advanced Learner's Dictionary

 

boo

 verb
verb
BrE BrE//buː//
 
; NAmE NAmE//buː//
 
Verb Forms present simple I / you / we / they boo
BrE BrE//buː//
 
; NAmE NAmE//buː//
 
he / she / it boos
BrE BrE//buːz//
 
; NAmE NAmE//buːz//
 
past simple booed
BrE BrE//buːd//
 
; NAmE NAmE//buːd//
 
past participle booed
BrE BrE//buːd//
 
; NAmE NAmE//buːd//
 
-ing form booing
BrE BrE//ˈbuːɪŋ//
 
; NAmE NAmE//ˈbuːɪŋ//
 
 
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[intransitive, transitive] 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. Word Origin early 19th cent.: imitative of the lowing of oxen (the sound was considered to be derisive); compare with hiss and hoot.
See the Oxford Advanced American Dictionary entry: boo