Definition of (as) silly (or mad or crazy) as a two-bob watch in English:

(as) silly (or mad or crazy) as a two-bob watch

phrase

NZ, Australian
informal
  • Unpredictable; foolish and absurd.

    ‘even as a nipper he was silly as a two-bob watch’
    • ‘This movie is a German import and is as silly as a two-bob watch.’
    • ‘Our brigadier, 'Mad Mick' Monaghan, was crazy as a two-bob watch.’
    • ‘She was a looker but silly as a two-bob watch.’
    • ‘'This is as crazy as a two-bob watch,' he muttered.’
    • ‘They say that by the end he was as silly as a two-bob watch.’