jargon.artrocity.com
New Hacker's Dictionary the Jargon File v 4.4.6
[From a quip in the ‘urgency’ field of a very optional software change request, ca.: 1982. It was something like “Urgency: Wash your dog first”.]
1. n. A project of minimal priority, undertaken as an escape from more serious work.
2. v. To engage in such a project. Many games and much freeware get written this way.