adjective Informal.
- excessively and foolishly enthusiastic: The public went gaga over the new fashions.
- ardently fond; infatuated: He’s gaga over the new girl in class.
- demented; crazy; dotty.
adjective informal
- senile; doting
- slightly crazy
“crazy, silly,” 1920, probably from French gaga “senile, foolish,” probably imitative of meaningless babbling.