Definition of (as) mad as a gum tree full of galahs in English:

(as) mad as a gum tree full of galahs

phrase

Australian
informal
  • (of a person) completely mad or irrational; crazy.

    ‘you're as mad as a gum tree full of galahs, sliding down that hill!’
    • ‘You're as mad as a gum tree full of galahs. Good luck and try and enjoy it.’
    • ‘I reckon we all pretty much agree that Chris is as mad as a gum tree full of galahs but we need the people like Chris of this world.’
    • ‘"She's as mad as a gum tree full of galahs," he wrote of Mandy.’
    • ‘"Mad as a gum tree full of galahs," he stormed. "Why don't they pay cash?!"’
    • ‘When they find out who hasn't turned up to play, they'll be as mad as a gum tree full of galahs.’