Matsup Posted in M Best definition Matsup Ketchup and Mustard that is pre mixed and bottled to be served as a condiment. Created by Cosmo Kramer of Kramerica. I love putting Matsup on my burgers, it saves me time and energy. How satisfied are you with the definition? Looking for Matsup meaning? Delighted that you discovered the greatest determine on our web site! Recently this definition was actually observed 66 times.