Cillian Derpy Share definition Flag Pretty much Cillian Murphy acting like a complete herp a derp in just about all of his films. Cillian Derpy crying in Watching the Detectives should be enough to prove the point. Cillian Derpy by cillianderpy September 26, 2010 0 0 Get merch Get the Cillian Derpy mug. Buy Now — $32.95 See more merch
