Definition of waka jumper in English:

waka jumper

noun

NZ
informal
  • An MP who leaves their political party during a parliamentary term.

    ‘the bill ensures that parliamentarians who are voted in by their electors cannot be waka jumpers’
    • ‘It's a provision Parliament put in place to help deter waka jumpers.’
    • ‘Haven't most of the waka jumpers of the last decade taken a step to the right?’
    • ‘His funding should not be reinstated by relying on a ridiculous technicality and a rule designed for a completely different purpose—to deter real waka jumpers.’
    • ‘Correct me if I'm wrong, but didn't I read that the waka jumper was one of the people who had visited the mansion?’
    • ‘Are waka jumpers necessary for minority representation?’
    • ‘I am intrigued to hear the only ones complaining about the party's amendment to their constitution are waka jumpers and traitors.’
    • ‘There are no potential coalition partners aside from the waka jumpers that will instantly leap back to Labour.’
    • ‘He headed back to Wellington as an independent MP today, adding his name to the notorious list of waka jumpers.’
    • ‘He is a waka jumper, and he has been in five political parties.’
    • ‘Those we have spoken to over the telephone or bumped into on the street keep reminding us that the people in the north don’t like waka jumpers.’

Origin

Early 21st century: from waka + jumper.