DOH
do, doh, ut
(noun) the syllable naming the first (tonic) note of any major scale in solmization
Source: WordNet® 3.1
Etymology 1
Popularized by the character Homer Simpson in the TV show the Simpsons (there spelled d'oh). The OED has references from the BBC as far back as 1945, however.
Interjection
doh
Expresses surprise and consternation at a stupid mistake made by oneself, or another person.
Etymology 2
An anglicised spelling of do.
Noun
doh (plural dohs)
(music) An anglicised spelling of do. A syllable used in solfège to represent the first and eighth tonic of a major scale.
Synonyms
• do
Anagrams
• OHD, hod
Source: Wiktionary