Definition of have a bird in US English:

have a bird

phrase

North American
informal
  • Be very shocked or agitated.

    ‘I would have a bird if my kids did this’
    • ‘"Hi Mutt, hey I've got a great joke to play on Alice. Lets fill out the card and then you leave and come back about two minutes after the game starts. She will have a bird."’
    • ‘But the critic from The Province came with his wife and had a bird.’
    • ‘The public seemed to like it, but the critic from the Vancouver Province came with his wife, and he had a bird: ‘How could I invite him to see this movie?’’