Swamp Opossum Share definition Flag Slang; used to describe one of the fattest asses one has ever seen. Jee willikers... look at the swamp opossum on her... Swamp Opossum by Tomkittycat February 6, 2020 0 0 Get merch Get the Swamp Opossum mug. Buy Now — $32.95 See more merch