Speaking to journalists in Sydney, the presenter reportedly called the prime minister a "one-eyed Scottish idiot".
Needless to say, the professionally uptight are all over this:
Gordon Banks, Labour MP for Ochil and South Perthshire, said the remark was "unforgivable". Scottish Labour leader Iain Gray also criticised Clarkson.
It is pretty unforgivable, to be fair. He didn't call him a cunt or a madman and he didn't remark on the Prime Mentalists dietary habits.
Come on Jeremy, up your game!