Gaga means wildly enthusiastic, or confused with age. Go gaga over him, gone a bit gaga, gaga about the baby.
The two senses are far apart and only the tone separates them: going gaga over something is delight, while going gaga is a cruel way of describing dementia. It is informal in both, and best avoided in the second.
1adjectivegagaWildly enthusiastic, or confused with age.
“Grandma went gaga over the new baby and knitted her a pile of tiny cardigans.”
gaga is a state.
French
gaga
English, today
gaga
Borrowed from French gaga.
Etymology from Wiktionary, CC BY-SA