gaga

Etymology 1

From French gaga.

adj

1. (informal) Mentally senile.
   The elderly patients in the hospital were going gaga.
2. (informal) Crazy.
   You might go gaga if you stare at this screen too long.
   Should he lose it once and for all, he and Kathleen would need lots of money. Also, he had said to me, you could be gaga in a tenured chair at Princeton, and would anybody notice? 1975, Saul Bellow, Humboldt's Gift, Viking, page ??
3. (informal) Infatuated.
   The girls were going gaga over the handsome new boy who joined the class.

Etymology 2

noun

1. Alternative form of ga-ga (“game resembling dodgeball”)