flabdominals Share definition Flag The fleshy, poochy, or jiggly layer of fat where a fit person's abdominal muscles would be. Maybe if you worked out ever, or ate something other than gummy bears and rice pudding, you wouldn't have such saggy flabdominals. flabdominals by erbaby February 26, 2008 0 0 Get merch Get the flabdominals mug. Buy Now — $32.95 See more merch