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1.
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!
Por echoseven75 29 de noviembre de 2013
 
2.
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.
Por SomeoneWhoIsntYou 23 de octubre de 2013
 
3.
12:30am
The time of the raid will be zero dark thirty.
Por Polley the Spy 16 de septiembre de 2013