Mark (and others)
I feel that I must advise you (and all other seppos) that I have taken it upon myself to educate you all. Henceforth, I will attempt to introduce one piece of non-American slang or spelling in each post. Maybe there should be a prize to the first Yank to guess the correct meaning?
Kanckered - literally what they do to male animals when desexing them (ie castrate). Also commonly used when talking about broken down horses, I believe the processing plants for dead horses was once known as the Knackery (not sure of spelling). Some Aussie synonyms would be: buggered, stuffed or FUBAR'd (I know this is an Americanism but it is commonly used).
Here endeth the sermon