oh dark hundred

noun

Some unspecified hour in the early morning (implies an unpleasant time to be awake)

“I had to get up at oh dark hundred to catch a plane.”

Similar
crack of dawnstupid o'clockwee small hours
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Meanings

noun

alternative 0-dark-hundred

  1. idiomaticSome unspecified hour in the early morning (implies an unpleasant time to be awake)

    I had to get up at oh dark hundred to catch a plane.

    Synonyms: crack of dawn, stupid o'clock, wee small hours

Synonyms & antonyms

nounSome unspecified hour in the early morning (implies an unpleasant time to be awake)

Similar
crack of dawnstupid o'clockwee small hours
Also see
ungodly hour

Origin

From military time, in which hours before 10:00 am are prefixed with a zero, read as "oh", and 00 minutes is read as "hundred", as in oh five-hundred for 5:00 am.

Full word history & related roots →
Cite this entry
APA

oh dark hundred. (n.d.). In WatkinsX Dictionary. Retrieved November 5, 2026, from https://dictionary.watkinsx.com/word/oh%20dark%20hundred

MLA

“oh dark hundred.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/oh%20dark%20hundred. Accessed November 5, 2026.

Chicago

WatkinsX Dictionary, s.v. “oh dark hundred,” accessed November 5, 2026, https://dictionary.watkinsx.com/word/oh%20dark%20hundred.

Source: oh dark hundred on Wiktionary, CC BY-SA 4.0.