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1.
A day of unseasonably warm weather following a lengthy stretch of cold weather that causes women to overcompensate by wearing unusually revealing or form-fitting clothing, thus accentuating their breasts and allowing men to see them for the first time in weeks or months.
The first warm day of spring at my college campus was the biggest Titties Is Out Day of the year.
by DCDLM February 08, 2007