The likelihood of an entitled white private school boy with a bad haircut rising to an Australian Liberal Party leadership position despite posting a racist video on Facebook.
Not to be confused with "Buckley's chance", which is not very likely at all.
Harrington: "OMG I can't believe the Aborigines didn't invent iPhones."
Chad: "OMG dude you've got Barclay's chance of being Prime Minister now!"