scup Share definition Flag Irish slang, originating in the Dundalk, Louth area. Meant for a positive outlook to a person or an object. Kind of like "up the". SCUP THE IRISHSCUP THE TOWNSCUP SCUP SCUP! scup by fizzybitchy December 14, 2009 0 0 Get merch Get the scup mug. Buy Now — $32.95 See more merch