caf /kæf/noun 3forms 2phrases 1 noun3 •(informal) A café.Fourth on the list of the businesses my father and his brothers had owned was a caf on the corner of San Ignacio and Lamparilla in Old Havana. — 2008 •(informal) A cafeteria.There are plenty of restaurants to choose from when you're sick of the ol’ caf food. — 2005 •A caffeinated coffee. formsCAFs · cafs Phrases with caf caf upTo ingest caffeine, such as via coffee or tea.