"gaga" in the adjective sense
1. doddering, doddery, gaga, senile
mentally or physically infirm with age
"his mother was doddering and frail"
2. crazy, wild, dotty, gaga
intensely enthusiastic about or preoccupied with
"crazy about cars and racing"
"they are dotty about each other"
"gaga over the rock group's new album"
Source: WordNet® (An amazing lexical database of English)
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