monkey catsup Share definition Flag the red stuff that comes out of monkeys every 28 days; also the best thing to eat a monkey with. Blimey, that monkey shot monkey catsup 50 feet out of its butt hole! Please pass the monkey catsup monkey catsup by scrammers May 31, 2007 0 0 Get merch Get the monkey catsup mug. Buy Now — $32.95 See more merch