From The Collaborative International Dictionary of English v.0.48:

gaga \gaga\ adj.
   1. mentally or physically infirm with age.

   Syn: doddering, senile.
        [WordNet 1.5]

   2. marked by foolish or unreasoning fondness; as, gaga over
      his girlfriend.

   Syn: crazy about, dotty, enamored, infatuated, in love,
        smitten, soft on(predicate), taken with(predicate).
        [WordNet 1.5]
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