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Simplified etymology
Gaga entered English in the early 20th century from French gaga, meaning “senile” or “a senile person.” The French word was based on gâteux, a form related to hospital slang gâteur, “bed-wetter.”
Etymology
Borrowed from French gaga, a nursery-like or imitative formation meaning senile or foolish. English later developed the informal sense 'wildly enthusiastic or infatuated.'