- dry as a dead dingo's donga
- more Catholic than the Pope
- psychoneuroendocrinological
- like a bull in a china shop
- queer as a clockwork orange
- hanged, drawn and quartered
- innocent as the babe unborn
- hoist with one's own petard
- hoisted by one's own petard
- hoisted on one's own petard
- slow as molasses in January
- oculodigitoesophagoduodenal
- up a creek without a paddle
- esophagogastroduodenoscopic
- one card shy of a full deck
- screwed, blued and tattooed
- screwed, glued and tattooed
- waist-deep in the Big Muddy
- spectroheliokinematographic
- hypothalamoadenohypophyseal
- hypothalamoadenohypophysial
- pseudopseudohypoparathyroid
- free, white, and twenty-one
Note: these words have been obtained from Wiktionary and have been classified and improved through automated computer linguistics processes.