Crazy, infatuated, or obsessed; acting silly or irrational, especially when in love.
Likely from the French word 'gaga' meaning senile or crazy, popularized in English during the early 1900s. The exact origin is uncertain, but it may imitate childish speech or babbling.
The phrase 'gaga over' someone means you're so love-struck you can't think straight—it's basically the scientific evidence that being in love actually makes your brain less rational!
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