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Short for "preparation day." Missionaries have one day of the week set aside for preparatory activities such as housecleaning, shopping, laundry, letter-writing, and, oh yes, recreation.

Officially, missionaries are supposed to wear their suits and ties on p-day, except when participating in sporting activities. In reality, there are no ties in sight on p-day. Officially, p-day starts at 6:30 am and ends at 6:30 pm. In reality, the fun often starts at 10:30 the night before, and doesn't end until until late in the p-day night.
Bill: Hey Elder John, what are you going to do tomorrow?
Elder John: Well, it's my P-Day so I'm going to go get some groceries, clean my apartment and go play some football!
by AaronTheMormon February 07, 2009

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A person in week one of bootcamp in the navy, P-days are the processing days where you learn that it is ACTUALLY possible to fall asleep standing up and that no matter what you do, it's wrong. You also learn what a knife hand looks like pointed straight at your throat while you quiver in your newly issued PT gear with your valuables sock sticking out of your sweatpants and your go fasters on your feet. Welcome to hell recruit.
In summary, P days: Literally the worst week of your life you'll ever experience

Senior div RCPO"Hey you see that baby div that just checked in? Remember when our eyes looked that dead?"
Senior div Yeoman *shudders with the thought of being in P-days*
by Thatgingerkid November 30, 2014

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Someone who loves to play so much however this person is also usually very selective in their playmates, and while they love to play they do not play with just anyone
oh my gosh your such a P-Day right now
by B-Dizzle Minizzle March 05, 2010

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The birthday when a woman is of legal age to consent to sexual activities with a adult.

P-Day originated as a joke on Late Night with Conan O'Brien. The skit involved drummer Max Weinberg counting down the days until Natalie Portman's 18th birthday.
Bob: Dude, check that ass out. I'd hit that shit if she weren't jail bait.

Joe: It's all good dude, her P-Day was last week.
by Xander Crews April 22, 2009

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When a women goes on her period
Timmy: hey brenda want to go on a water slide
Brenda: no sorry its my p-day so i cant do anything

Timmy: tgat sucks
by Chace fortan April 04, 2016

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