piffy on a rock bun
Definition from Wiktionary, the free dictionary
Age and etymology are uncertain, it existed in the 1930s and possibly derives from a music hall catchphrase. Some commentators (e.g. World Wide Words) suggest that piffy may have originally been patience, and the rock bun was simply a type of cake.
- (slang, Britain, idiomatic) A person ignored or sidelined from an activity
- I hate your works parties; you always talk shop with your mates and leave me sat like piffy on a rock bun.