O-Dark Hundred
(n.) Very early in the morning. Stupid o’clock, O-silly hundred, O-four Fuck’s Sake , Dark o’clock, Crack of a sparrow’s, Early doors
The Aircrew Dictionary (of unacceptable cliche and overused phrases)
(n.) Very early in the morning. Stupid o’clock, O-silly hundred, O-four Fuck’s Sake , Dark o’clock, Crack of a sparrow’s, Early doors