To a non-aussie, the polititian speak is pretty darn bizarre. On the first read, I thought you were describing a physical assault...

Our system elects Members of Parliament (MPs), who then choose the Prime Minister(PM) from the pool of MPs.

However what that means is that at any point the MPs from the majority party can oust the PM and change them out with another MP.

This has become more common recently with several of our sitting PM's being 'knifed' aka backstabbed in recent years.