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 December 26, 2015
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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 23, 2009
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18th April is the Lucy Parker appreciation day as she is very cool and very nice to Euan and everyone else so we appreciate her she is awesome!
Happy Lucy P Appreciation Day, Beef Stew.
by hodz April 18, 2022
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