Banned Wordy Wise

There’s a feature in the Daily Mail called “Peterborough”, to which readers can contribute. Here at the Mansion, the staff like to offer suggestions to the "Wordy Wise" section, which involves creating new words or phrases, with an appropriate explanation, by changing a letter of an existing word. Strangely, theirs never seem to be published. Maybe an example will explain why:
egotestical – bloke who thinks he’s the dog’s bollocks.