Definition of gaga adjective from the Oxford Advanced Learner's Dictionary

     

    gaga

     adjective
    adjective
    BrE BrE//ˈɡɑːɡɑː//
     
    ; NAmE NAmE//ˈɡɑːɡɑː//
     
    [not usually before noun](informal) Describing strange traits, Love
     
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  1. 1(offensive) confused and not able to think clearly, especially because you are old He has gone completely gaga. He went a bit gaga after the accident. She seems to think we’re all gaga.
  2. 2slightly crazy because you are very excited about somebody/something, or very much in love The fans went totally gaga over the band. See related entries: Describing strange traits, Love
  3. Word Origin early 20th cent.: from French, ‘senile, a senile person’, reduplication based on gâteux, variant of gâteur, hospital slang in the sense ‘bed-wetter’.
See the Oxford Advanced American Dictionary entry: gaga