most sincerely dead

From The Wizard of Oz when the Munchkin coroner declares the witch most sincerely dead. Now commonly used for comatose organ donors who have been declared brain dead.

ICU Nurse: "We've got a comatose head trauma with a signed donor card. Just declared brain dead, so you can assemble the harvest team stat."
Transplant coordinator: "How dead is he?"
ICU Nurse: "Oh, he's really most sincerely dead."