9 Answers

....chiefly British, a mess or mixture 

Not sure where it originated,  but apparently it started being used as an expression in the 40s. The meaning is to discribe some thing that is a mess.on the other hand ,if you say someone is done up like a dogs dinner, it means they are very smart.

Maybe from here: https://www.facebook.com/uniladmag/videos/2852776568078717/

More than likely an Australian or New Zealand Phrase and origination..Have a look at this..>>>>>>>><<<<<<<<.. http://www.phrases.org.uk/meanings/114550.html      https://en.wikipedia.org/wiki/Eric_Partridge 

maybe because  a dog eats it's own vomit. That was even mentioned in the Bible.

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