The term "coffee subcutaneum" refers to a substance used for medical purposes, specifically anesthesia. The spelling of this term can be explained using the IPA phonetic transcription. "Coffee" is spelled /ˈkɒfi/, while "subcutaneum" is spelled /sʌbkjʊˈteɪniəm/. The word "subcutaneum" refers to a layer of tissue beneath the skin, and when combined with "coffee", it denotes an anesthetic injection that is administered subcutaneously using a coffee solution. While the term may seem unusual, it is a valid medical term used in anesthesia practices.
Cola.
A practical medical dictionary. By Stedman, Thomas Lathrop. Published 1920.