caf-fiend Share definition Flag a caffeine addict, someone who enjoys caffeine so much that they will do anything to get it. "Melissa, that's your 2nd rockstar and third cup of coffee! Caf-fiend!" caf-fiend by mclovin' August 26, 2007 0 0 Get merch Get the caf-fiend mug. Buy Now — $32.95 See more merch