Longman Dictionary of Contemporary English homepage

Date: 1900-2000
Language: French
Origin: gaga 'stupid person'

gaga

adjective
     
ga‧ga [not before noun] informal
1 an insulting word used to describe someone who is confused because they are old:
Sid keeps forgetting my name. I think he's going a bit gaga.
2 having a strong but often temporary feeling of love for someone [= infatuated]
gaga about/over
I can't imagine why Susan is so gaga about him.

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