Peek-a-poop Share definition Flag A peek-A-poop, a poop that starts to come out but then quickly retracts leaving you disappointed. "Dude, I had three peek-A-poops today and I'm starting to get mad." Peek-a-poop by PikachuIseeYou June 14, 2013 0 0 Get merch Get the Peek-a-poop mug. Buy Now — $32.95 See more merch