A Douglas Adams original, was used multiple times in his book "The Hitchhiker's Guide to the Galaxy". Usually (but not necessarily) following "a load of", dingo's kidneys means rubbish, bollucks, crap or bullshit.
Seriously? I have to give an example in a sentence? I can't just leave it blank? WTF?! That's a load of dingo's kidneys!
A phrase used when someone is asking for something unreasonable. I coined this one myself when I was in college and the other classes kept bumming things off us.
'Can we have some of your milk'?
'Yeah, sure.'
'Can we have some of your tea bags?'
'Yeah, just please get your own supply sometime will you goddammit?'
'Can we have some of your biscuits?'
'Ngh. Would you like one of my kidneys with that?'