a dog's dinner
Something that is very messy and/or disorganized. I really need to clean out my closet—it's starting to look like a dog's dinner in there.
a dog's dinner (or breakfast)
a poor piece of work; a mess. British informal The image is of a dog's meal of jumbled-up scraps.
2000 Independent He was rightly sacked because he had made such a dog's dinner of an important job.
a dog’s ˈbreakfast/ˈdinner
(British English, informal) a very untidy piece of work; a mess: Don’t ask Julie to help you with the decorating — she made a complete dog’s breakfast of painting the kitchen!