1
informal
: marked by extreme enthusiasm : infatuated
She is gaga about/over golf.
… in one day, the book was a best seller and America was gaga over crosswords.—Richard Wolkomir
—often used with go
The crowd went gaga over the new film star.
2
informal
: marked by thought or action that lacks good sense or judgment : foolish
He thinks all bungee jumpers are a bit gaga.
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Merriam-Webster unabridged
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