Definition of shaddup in English:

shaddup

exclamation

informal
  • Be quiet!

    ‘‘Shaddup! If he wants to confess, let him.’’
    • ‘Oh, shaddup, and get that smug look on your face.’
    • ‘Behold your football fortune: introducing the one, the only, the magnificent - just shaddup and answer the questions already, will ya?’
    • ‘The climax comes one Sunday when he throws a flag demanding the jock announcers shaddup.’
    • ‘Oh shaddup, I've had enough Alicia Keys this week.’
    • ‘Still, I'm not sure the Voice is going to shaddup.’

Origin

1950s: representing a pronunciation of shut up.

Pronunciation

shaddup

/ʃʌˈdʌp/