Oh-dark-hundred Definition
noun
(idiomatic) 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.
Wiktionary
Origin of Oh-dark-hundred
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.
From Wiktionary
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