The Meaning of Bishfest

Our ryhming slang correspondent from Bucks wrties

In the course of a delightful evening at our local French pub - "Le Soppy Hog" perusing yet another load of what our Scottish friends would call "gloopy pesh" in that obscure journal, the Shy Pope Log, I noticed that the word "Bishfest" has crept into our language. A search on Google now reveals more than "an annual festival set in the rolling hills of Buckinghamshire".
I haven't been able to discover its meaning, (something to do with a rant about software that doesn't work) but perhaps one of your readers can help me?

Arthur P Bottlebank (Miss)
Arbroath

No elucidation comes from either Urban Dictionary or Webopedia. Comments or explanations welcome.