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In Counter strike, You slaughter a group of CTs or Ts using any weapon (the Paratrooper gun preferred) and doing such thing without warning.
Game : TERRORIST WIN

Coqfag5: Bitch you just d-day'd me and my squad!

Terroristtbag1337: Hehehe
D-day'd by NF-C08 August 5, 2009

D-Day File 

An off-site file, thumb drive, or backup server with highly sensitive information to be used in the event of litigation, hostile work environment, EEOC claim, termination, a drop-dead-date, deadline or death. Information that is usually used by a whistleblower or other insider to seek justice or self-protection from incrimination by association. Also referred to as plan b, a burn file, or a scorched earth policy.
The Watergate scandal had insider information from Deep Throat. He provided detailed information on corruption within the Presidential Administration.

It is presumed that Lois Lerner, who is seeking immunity, has a D-Day File, now that the IRS has destroyed evidence in the IRS corruption scandal.
D-Day File by Wordsmyter June 26, 2014

D-Day File 

An off-site file, thumb drive, or backup server with highly sensitive information to be used in the event of litigation, hostile work environment, EEOC claim, termination, a drop-dead-date, deadline or death. Information that is usually used by a whistleblower or other insider to seek justice or self-protection from incrimination by association. Also referred to as plan b, a burn file, or a scorched earth policy.
The Watergate scandal had insider information from Deep Throat. He provided detailed information on corruption within the Presidential Administration.

It is presumed that Lois Lerner, who is seeking immunity, has a D-Day File, now that the IRS has destroyed evidence in the IRS corruption scandal.
D-Day File by Wordsmyter June 26, 2014

D-day capacitor 

Noun. The part of the brain normally only found in female humans though not exclusively, which stores each and every little thing a partner does wrong, which is annoying, etc. Instead of sending the signal "They have done something you do not like. Tell them so they can learn and grow.", this brain centre will store all these incidents. Then, on the day they wish to dump their partner (D-day), this part of the brain will unleash all these stored memories to counteract the guilt caused in the act of dumping.
"And they told me of the time I did the laundry and left a dirty sock in the basket. And the time I asked to live together, and they assumed I meant right now. And one day cleaning the cutlery and pots, I left a fork on the counter, and..."
"Dude! They fully discharged their D-day capacitor on you! I'll never get why people do that instead of telling you right away, so it doesn't eat away at them and allows you to learn from your mistakes."

Pro-D Day 

For some, a district-wide Pro-D Day is a welcome break from the normal daily drudgery of doing boring schoolwork. Hats are thrown in the air to celebrate this occasion, as children run into the streets to frolic amongst one another.

However, one is missing. This child is completing the next chapter's math assignments. He is double checking, triple checking, and then rewriting them in three different languages.

For the sake of anonymity, we will name this child Jacob - which in ancient Piemessessian (the language of Piemessess) means "he who has no life".

Truly, Pro-D Days are seen differently by all; just some a little more than others.
Jacob: "Oh damn, it's a Pro-D Day tomorrow. I won't be able to come in and ask the math teachers some questions on next year's midterm exam problems."
Pro-D Day by Civilian of October 20, 2006
Sexual move

Place your woman in a firm position craddled in your lap anchored by your cock and run naked up a beach while germans shoot guns at you.
Barry and jill were mown down on a D-day
The D-day by Awsomeo 5000 February 28, 2005