PCD
Post coital depression. When you wake up after a lager frenzy with the bride of Frankenstien lying next to you with a grin on his/her face.
After the freshers ball Rupert was in PCD for over a week.
by cpRttech June 20, 2007
PCD
Post Creep Depression. Taken from Jersey Shore's verb "to creep" This is the act of wanting to commit suicide the next day after partying hard and creeping on girls all night.

Combined with being hungover and learning of all the stupid shit one has done, he or she contemplates jumping of a roof or sliting ones wrist the next day.

This also occurs following an awesome outing or trip with friends after a long night of drinking and realizing that the fun is now over and have to go back to your shitty life.
Guy: Man I can't believe I threw up all over that hot chick last night while we were making out.

Friend: Yea, that sucks that you're gonna hafta see her in your Econ class tomorrow.

Guy: Man this PCD sucks, I think I'm going to go take a bath with the toaster.
by Hitz September 10, 2010
PCD
Post Concert Depression

After the sudden increase of adrenaline one experiences during a concert, many people feel depressed and empty afterwards and constantly feel the urge to cry. PCD often lasts roughly 3 days after a show but can potentially linger for weeks.
I feel ya, man. I miss them so much already that I'm physically in pain. We've got a case of PCD.
by ConcertGoer7 April 18, 2011
PCD
Post Convention Depression

It's the feeling of missing your friends and the fun you had in the convention you just went to and got home from. It's actually a common feeling from con-goers. (Like me ^^) It usually passes though in 1-4 days.
Friend: He's having PCD right now after that awesome convention at Pittsburgh.

Me: Awwr =/ i knows how that feels.
by Tanor Faux November 22, 2010
PCD
Post Convention Depression that is always, always suffered after an amazing BBYO convention full of friends, spooey, Alephs, BBGs, leadership, dancing, and admiring the amazing regional board.
Me: So, studying for the AP Calc test?
Aleph Boy: No, I can't think about school with my PCD.
by beautyanddelusion May 07, 2012
PCD
Post-Con-Depression.
A feeling felt by most furries after leaving a con and resuming their boring lives.
Ted was dealing with a heavy case of PCD after leaving Anthrocon '09.
by Dysto June 12, 2011
PCD
PCD stands for programmed cell death. This happens when a cell is in a state of poor health/disrepair, so release of special proteins (like cytochrome c - found in mitochondria) either from inside of the cell or by another cell, triggers an organized chain reaction of events, resulting in the degradation and destruction of proteins and nucleic acids inside the cell.
The genes responsible for the proteins that signal PCD are not working correctly in cancer cells.
Bob "Have you heard that cells can commit suicide?"
Pete "No"
Bob "This is also referred to as PCD, or apoptosis"
Pete "Is that going to be on the finals?"
Bob "Definitely!"
by dicAcielcunobiryxoeD June 10, 2008
PCD
Pitch Circle Diameter.

Refers to the number of lug nuts in a wheel and the distance from one lug to the opposite end of the lug arrangement. This is also known as the bolt pattern.

Typically expressed in (Number of Lugs) X (Distance), for example, 5x4.50 (in inches) or 5x114.3 (in metric).
Mike: I'm looking for some new wheels for my BMW, what PCD would that be?

Paul: The bolt pattern for all BMW vehicles is always 5x120.
by Tatsumatic March 17, 2011

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