"D'oh!" is a catch phrase used by the fictional character Homer Simpson, from the long-running animated sitcom The Simpsons (1989–present). Originally written in a script as an "annoyed grunt", Dan Castellaneta rendered it as a drawn out "d'ooooooh". This was inspired by a minced oath used by Jimmy Finlayson in several Laurel and Hardy films. Matt Groening felt that it...