Do'h - meaning and definition. What is Do'h
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What (who) is Do'h - definition

CATCHPHRASE USED BY HOMER SIMPSON
Annoyed grunt; D'oh; D-oh; D'oheth!; D'ohnuts; Duuh; Doh!; Do'h!; Do'h; (Annoyed Grunt); "D'oh!"; D'OH; D’oh!; D’oh; Annoyed Grunt

Do'h         
(Make famous by Homer Simpson.) Used to show regret upon doing a stupid act or forgetting something.
Homer, did you remember to wear pants? Do'h!
do'h         
All purpose exclamation as popularized by Homer Simpson
Hey, Homer, should your car be towed away like that? Do'h!
d'oh!         
Literally a contraction of Duh... Oh! made famous by Homer Simpson. Used to denote anything from surprise to being caught, to forgetting something, etc.
Homer, did you remember our anniversary? Homer - D'OH!

Wikipedia

D'oh!

"D'oh!" () is the most famous catchphrase used by the fictional character Homer Simpson, from The Simpsons, an animated sitcom. It is an exclamation typically used after Homer injures himself, realizes that he has done something foolish, or when something bad has happened or is about to happen to him. All his prominent blood relations—son Bart, daughters Lisa and Maggie, his father, his mother and half-brother—have also been heard to use it themselves in similar circumstances. On a few occasions, Homer's wife Marge and characters outside the family such as Mr. Burns and Sideshow Bob 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. The spoken word "d'oh" is a sound trademark of 20th Century Fox (now known as 20th Century Studios). Since 2001, the word "doh" has appeared in the Oxford English Dictionary, without the apostrophe. Early recorded usages of the sound "d'oh" are in numerous episodes of the BBC Radio series It's That Man Again between 1945 and 1949, but the OxfordWords blog notes "Homer was responsible for popularizing it as an exclamation of frustration." The term also appeared in an early issue of Mad comics, with a different spelling but the same meaning, in issue 8 (December 1953 – January 1954); in a one-page story by Harvey Kurtzman entitled "Hey Look!", a man seeking peace and quiet suddenly hears a loud radio and, grimacing, says, "D-oooh – the neighbors [sic] radio!!"