dark-thirty 

the thirty minutes before nightfall, or the thirty minutes after night falls.basically the 1 hour time frame as it becomes dark.

i told david the party starts at dark-thirty.

dark-thirty by da trick biatch December 20, 2005

dark-thirty 

It is actually o' dark-thirty. It is a military term refering to beinging somewhere before the sun rises

We have to go, we have PT (physical training)at 0' dark-thirty.

dark-thirty by Goldi December 28, 2005

dark-thirty 

the hour of the day that it becomes dark so it could be a half hour before or a half hour after it gets dark

i told bobby and jonny boy to be at my house to suck some little dick at dark-thirty

dark-thirty by i put things where they belong March 30, 2010

Dark Thirty 

Long past dark. Much later than after dark.

The sun went down at eight. We were out until ten. We were out past dark thirty.

Dark Thirty by Ranger Wordsmith September 5, 2015

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

o-dark-thirty 

Military time designating an unspecified time after midnight but before sunrise. Normally used in reference to either the time one goes to sleep, wakes up, or has to be on-the-job. Usually quite a while before sunrise, i.e.: well before 0500 hours ( 5AM for you civilians )

The name is a play on the way 24-hour time is handled in the Military. Times are pronounced as numbers and written without colons, i.e.: 4:30PM is 1630H or "sixteen-thirty hours". Times between midnight and noon such as 4:00AM are written as 0400 and have the leading zero called out as "zero" or the letter "O", as in "o-four-hundred".

Example: We had to get up at o-dark-thirty to get the job done this morning.

o-dark-thirty by Princess Die December 2, 2005

O’Dark-Thirty 

Very early in the morning. O’Dark-thirty is aviator speak for those bleak, lonely hours between midnight and 05:00 am. Those hours when your brain is telling your body to rest, relax, sleep.

"During Basic Training you WILL be getting up at O'Dark Thirty!"

O’Dark-Thirty by chalk757 July 28, 2004