from Wiktionary, Creative Commons Attribution/Share-Alike License
- interj. Expresses frustration or anger, especially at one’s own stupidity.
Imitative. Later popularised by the cartoon character Homer Simpson in The Simpsons. Voice actor Dan Castellaneta has said he modelled his version on the drawn-out "do-o-o-o" sound made by Jimmy Finlayson in the films of Laurel and Hardy. (Wiktionary)