Definition of attagirl exclamation from the Oxford Advanced Learner's Dictionary

 

attagirl

 exclamation
exclamation
BrE BrE//ˈætəɡɜːl//
 
; NAmE NAmE//ˈætəɡɜːrl//
 
(informal, especially North American English)
 
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used when you want to encourage a girl or woman, or show your admiration of them see also attaboy Word Origin 1920s: on the pattern of attaboy.
See the Oxford Advanced American Dictionary entry: attagirl