"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 would better suit the timing of animation if it were spoken faster, so Castellaneta then shortened it to a quickly uttered "D'oh!" Homer's ubiquitous catch phrase was famously added to the Oxford English Dictionary in 2001, without the apostrophe. The spoken word "D'oh" is a sound trademark of 20th Century Fox. It is typically used when Homer injures himself, realizes that he has done something stupid, or when something bad has happened or is about to happen to him.

Other members of his family—including Bart, Marge, Lisa, Grampa, and even his mother and brother—have been known to use it themselves. Other characters (Mr. Burns, etc.) have also used this phrase.

In 2006, "D'oh!" was listed as number six on TV Land's list of the 100 greatest television catchphrases.

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