Perryatric Share definition Flag A teenage or adult fan of Phineas and Ferb. From Perry the platypus’ name combined with ‘geriatric’, a word for an old person. How many other Perryatrics want to see Candace Against The Universe? Perryatric by PonyTrainBoi August 2, 2020 0 0 Get merch Get the Perryatric mug. Buy Now — $32.95 See more merch