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Zero dark thirty 

A humorous way to declare an unknown time in the wee hours of the morning. Especially used by military personnel to describe an unwanted time to be awake or awaken. Usually pronounced "oh" dark thirty.
"What time is morning formation?"

"Have no clue, oh dark thirty I imagine!"

Sgt. Hanson always has us up at zero dark thirty for our morning runs!
Zero dark thirty by echoseven75 November 29, 2013

Zero Dark Stupid 

Originating from Zero Dark Hundred and the more well known Zero Dark Thirty; All being variations of military timings meaning midnight, or half past midnight.

Zero Dark Stupid is a generalization of these timings, meaning "at some ungodly hour in the morning".
Private Pyle had to get up at zero dark stupid and run laps around the camp, or else the DI would stomp his guts out for being a famf.
Zero Dark Stupid by George Clemens January 29, 2019

zero dark thirty 

Going completely silent from social networking, un-necessary relationships and distractions until the ultimate goal is attained.
I´m wasting too much time here. I´ve got to focus and go Zero Dark Thirty.

zero dark hundred 

term arising from the military use of a 24 hour clock (0800 for 8 AM and 2000 for 8 PM- for those people who can't tell if its day or night) e.g. zero three hundred is 3 AM. zero dark hundred is usually inferred to as being sometime after last call and before reville...anytime between 2 and 5 AM. In other words, Waaay to fucking early to get up and go on watch, or on a 20 mile hike.
Whaddaya mean 'patrol'? it's still zero dark hundred!
zero dark hundred by mike, PS1, USCG December 30, 2006

Zero-Dark-Buffalo-Hour 

A time to be ready that is considered too early in the morning. Usually, it is a time between 02:00 and 05:00 a.m.
Example One:
Director: Tomorrow's schedule begins at 05:00 a.m., so be ready by 04:30 a.m.
Employee (under his breath): Oh crap! Another Zero-Dark-Buffalo-Hour timing!

Example Two:
Employee One: What time do we have to be ready?
Employee Two: Zero-Dark-Buffalo-Hour
Employee One: Shit! I wanted to sleep in!

zero dark thirty 

12:30am
The time of the raid will be zero dark thirty.
zero dark thirty by Polley the Spy September 17, 2013