Mr. Sippi Share definition Flag The little-known "spouse state" next to the one which America's longest river is named after. The similar-sized state that's "next-door" to Mississippi is Louisiana, so I wonder if Mr. Sippi's first name is "Louis"? Mr. Sippi by QuacksO March 10, 2019 0 0 Get merch Get the Mr. Sippi mug. Buy Now — $32.95 See more merch