形容詞 gaga:

1. mentally or physically infirm with age
   同義詞：doddering, doddery, senile
2. marked by foolish or unreasoning fondness
   同義詞：crazy, dotty, enamored, infatuated, in love, smitten, soft on, taken with

1. She is gaga about jazz.
   她對爵士樂著了迷。
2. He has gone quite gaga.
   他有點兒老糊涂了。

ga.ga

adj.Informal （形容詞）【非正式用語】
Silly; crazy.
傻的；瘋癲的
Completely absorbed, infatuated, or excited:
狂熱的：極為專注的、著迷的或狂熱的：
例句：
They were gaga over the rock group`s new album.
他們對滾石樂隊的新專輯迷得發(fā)狂

Senile; doddering.
年老糊涂的；遲鈍的

來源：
French [old fool, gaga]
法語 [老糊涂，瘋子]
[of imitative origin]
[源于模仿]