Approxiphone

a word that sounds so similar to another word that it's often mistaken for, or erroneously used in place of, the correct word.

Misspoken figures of speech are often ripe with approxiphones. For example, "for all intensive purposes" instead of "for all intents and purposes" or "old timer's disease" instead of "Alzheimer's disease".

pomme de boeuf

Translated from french, means "apple of beef". The meaty lobe of tissue that joins the lower butt-cheek to the upper, inner/back portion of the thigh. It's not quite the butt-cheek, and not quite the thigh, but a small, meaty thing all its own.

Frank had always preferred to be bitten on the pomme de boeuf, so proper hygiene and grooming was an imperative for him.