Definition of attaboy exclamation from the Oxford Advanced American Dictionary

 

attaboy

 exclamation
exclamation
NAmE//ˈæt̮əˌbɔɪ//
 
(informal)
 
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used when you want to encourage someone or show your admiration of them, especially a boy or man see also attagirl
See the Oxford Advanced Learner's Dictionary entry: attaboy