The crossword solutions for the term DINER CUPFUL, SLANGILY are JOE, which is a slang term for a cup of coffee. The term 'JOE' is believed to have originated in the United States in the early 1900s and is thought to be derived from the name of Josephus Daniels, the Secretary of the Navy under President Woodrow Wilson. It is also believed that the term was used by American soldiers during World War I to refer to coffee.