1 definition by Xander Crews

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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