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!
ayon kay echoseven75 ika-29 ng Nobyembre, 2013
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.
ayon kay SomeoneWhoIsntYou ika-23 ng Oktubre, 2013
12:30am
The time of the raid will be zero dark thirty.
ayon kay Polley the Spy ika-16 ng Setyembre, 2013

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