Expression used in online discussion forums relating to mental illness. Originally referred to the time that depression set in, later used conversely by survivors to indicate when their recovery was complete. This confusion has seen it fall out of favor in many circles.

Derived from "d-day", the storming of Normandy on June 6, 1943, and the fact that the word "depression" is often abbreviated to "D" in such forums, as people suffering from "D" have little energy and typing the whole word could be tiring.
I recall my own personal D-Day well; once I took the little green pills, I felt better.
by Googles September 12, 2004
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Someone who you do not want to mess with, or fight, but at the same time is a 'ladies man'. Compared closely to Shaft or James Bond.
"Man, that guy is this shit! He get the girls, and he's tough as hell! He's a damn DDay!
by God December 28, 2005
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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."
by Civilian of October 20, 2006
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Verb : The act of correcting a Grammar Nazi.
Person 1 : It's your fault!

Person 2 : *you're

Person 1 : *your. It indicates posession.

Person 2 : Ach! Du hast mich Grammar D-Dayed!
by asdasfasdf April 2, 2011
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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.
by Wordsmyter June 26, 2014
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A day in which two individuals partake in sexual activity

In other words

D-day: a day to lay down some d
John: wanna chill at the game this friday?
Joe: nah me and my gal gotta d-day on friday
by HistorySlut666 September 12, 2019
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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.
by Wordsmyter June 26, 2014
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