Gaga (adjective)

1. Mentally or emotionally disoriented; crazy or senile.
2. Very enthusiastic or excited, especially in an uncontrolled or excessive way.

Origin:

Unknown.

Examples:

1. She became gaga in her old age.
2. The fans went gaga over the new album.
3. He was gaga about the new technology.
4. She was gaga about the dress.
5. The crowd went gaga when the singer came on stage.