What does a dog's breakfast mean?

a dog's breakfast meaning in Urban Dictionary

Very simply -- Vomit. Perhaps you have seen your pet dog eating vomit?Usually refers to the vomit resulting from a full night of ingesting, for this reason, becoming therefore drunk, one vomits on the street, and, becoming that intoxicated, you have frequently acted really stupid through the evening. The term "your pet dog's breakfast" is generally related to the way in which you have acted prior to the ensuing nausea. Term popularized by the sit-com Kath and Kim (AUS).