butcher's turd
A standard of unimaginable richness, originally used to complement a host's cooking at polite dinner parties. Latterly - and frankly much more amusingly - used to indicate extreme hypocrisy in the actions of public figures.
"Mrs Bennet, I do declare, your devilled kidneys really are as rich as a butcher's turd" - Jane Austen, 'Pride and Prejudice'. "Straight from invading Iraq and Afganistan, Tony Blair has laid a fresh butcher's turd by accepting the role of Middle East Peace Envoy" - Jon Snow, Channel 4 News.