Definition of bill and coo in English:

bill and coo

phrase

informal
  • Behave or talk in a very loving or sentimental way.

    • ‘Humans - girl and boy - can learn from the strategies of the male bird when looking for a mate with whom to bill and coo.’
    • ‘In The Abdication, they bill and coo once again-this time with spiritual fervor.’
    • ‘My own personal wife and I hardly ever bill and coo early in the morning any more.’
    • ‘The media arts are still young, but not so young, in my opinion, that we need to see more pieces which are catalogs of effects with nothing to say behind them, and then bill and coo over how wonderful they are.’