According to the search results, "gaga" has several meanings, including:
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Marked by extreme enthusiasm or infatuation: This is the most common definition of "gaga". For example, someone might be "gaga" over a new hobby or celebrity.
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Mentally confused or crazy: This definition is less common, but still appears in some sources. It can refer to someone who is senile or doddering, or to someone who is eccentric or batty.
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A noise made by a baby trying to imitate speech: This is a less common definition that appears in one source.
Overall, the meaning of "gaga" depends on the context in which it is used.
