Bird scratch Share definition Flag When you've had too much fiber and it feels as though you're pooping out a birds nest. It leaves you with an itchy butthole. Hey, Charlie! After I eat all that Raisin Bran, I got some mad bird scratch. Bird scratch by CBCAKM September 3, 2017 0 0 Get merch Get the Bird scratch mug. Buy Now — $32.95 See more merch