Definition of chuck (or throw) a willy in English:

chuck (or throw) a willy

phrase

Australian, NZ
informal
  • Display sudden anger.

    ‘he chucks a willy when I ask him if he is ready to say sorry’
    • ‘"Are you quite certain you didn't put it there? Innocently, I mean, just hoping she'd throw a willy."’
    • ‘Maynard will chuck a willy if you compare them to each other.’
    • ‘Royce'd throw a willy if he caught you out here.’
    • ‘Most receivers just don't like the cloud storage, and chuck a willy.’
    • ‘Although you have cast dispersions on my integrity, I will not throw a willy.’