a ‧ gog /əˈɡɒɡ $ əˈɡɑːɡ/ BrE AmE adjective [not before noun]
[ Date: 1400-1500 ; Language: Old French ; Origin: en gogues 'in enjoyment, laughing' ]
very excited about something and wanting to find out more:
I’ve been agog all afternoon, waiting for the next part of your story.
Paul was agog with curiosity.