O dark -thirty

Very early. Early enough to seriously fuck up the day before, and the day of the event in question.

Yo...we had to get up at O dark -thirty to get to the meeting on time.

by Rick Burns December 21, 2006

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

by i put things where they belong March 30, 2010

zero dark thirty

12:30am

The time of the raid will be zero dark thirty.

by Polley the Spy September 16, 2013

twelve dark thirty

A time in the evening when it's very late, you are very trashed, and the end of your night is approaching. Usually a time of the evening when your condition allows you to make bad choices.

Guy 1: "I think that chick at the end of the bar wants to go home with me..."

Guy 2: "Man, she is really hit... It must be twelve dark thirty...

by larryj March 13, 2010