Phrs. Heard in phrases expressing upset that one has been ignored or left out of an activity. Often heard shortened to "like piffy on a rock", and also just "like piffy". Etymology unknown. E.g."She forgot to tell me the meal had been cancelled, and left me standing in the rain like piffy."[North-west use]
PIFFY ON A ROCK BUN
Meaning of PIFFY ON A ROCK BUN in English
Slang English vocab. Английский сленговый словарь. 2012