Top Definition
The day after Valentines Day (Feb 15), in which Planned Parenthood and many pharmacies, experience an acute spike in the sales of the Plan B pill (aka morning after pill) as a method of emergency contraception.
After a wonderful Valentines Day, Claire reluctantly found herself celebrating National Plan B Day with several other girls who were waiting in line at Planned Parenthood.
by Bzx77 February 14, 2011

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