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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]