[ˈɡaɡə], (Adjective)

Definitions:
- very enthusiastic and excited about someone or something
(e.g: moviegoers went gaga over Harry Potter)

- no longer in possession of all one's mental faculties, especially on account of old age
(e.g: I want to write my memoirs before I go too gaga)


Phrases:

Origin:
early 20th century: from French, ‘senile, a senile person’, reduplication based on gâteux, variant of gâteur, hospital slang in the sense ‘bed-wetter’