Unless you're familiar with Australian English and Australian politics, this one is going to baffle you.
In fact, I'm still somewhat baffled, even after reading (what I think is) the associated story. It may help you to know that Shorten is "federal Labor powerbroker Bill Shorten", Brumby is John Brumby, the premier of Victoria, cops is a verb form meaning (I think) "receives" and beating is a reference to the political defeat of an MP named Craig Langdon and/or the consequences of his resignation. Or something like that.
[Hat tip to Dave Ripley]