Cup of Joe is a slang for "cup of coffee". "Cup of Joe" is said to be named after Josephus Daniels (1862-1948) which was appointed Secretary of the U.S. Navy by President Woodrow Wilson in 1913. As a Secretary of the U.S. Navy, one of his numerous reforms was the abolition of the officers' wine mess, since then, the strongest drink aboard navy ships was coffee and over the years, a cup of coffee became known as a "Cup of Joe".