Top Definition
The first day of the year in which the weather is nice enough for girls to wear shorts/skirts and show some skin; particularly celebrated on a college campus.
Meghan's cleavage had been hibernating for the winter. It was not until Boner Day that I got to see her voluminous rack.
by The Nightman April 16, 2009
The first warm day of the year, when women break out their summer outfits, and the streets are flooded with skin after a long, cold winter.
Hey...Tim...want to hit a patio? Today's Boner Day.
by Jer_TO May 06, 2013
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