Also "hoovering the cat", "waxing the cat", and "sharpening your bowling balls".
Any excuse to avoid serious writing.
You know you should be working on your story, but first you have to make the bed. And sweep the floor. And dust the shelves. And water the lawn. And trim the hedges. And wash the car. And paint the house. And shingle the roof… And vacuum the cat.
Also used to refer to writings other than what you 'should' be writing. For example, character profiles, time lines, lists, story ideas, maps, detailed location descriptions, and wiki entries.