Definition of gaga adjective from the Oxford Advanced American Dictionary

     

    gaga

     adjective
    adjective
    NAmE//ˈɡɑɡɑ//
     
    [not usually before noun](informal)
     
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  1. 1 slightly crazy because you are very excited about someone or something, or very much in love The fans went totally gaga over the band.
  2. 2 (offensive) slightly crazy or silly Don't listen to him; he's a little gaga.
See the Oxford Advanced Learner's Dictionary entry: gaga