February 15th The day men take there side piece(the other girl he is dating on the side) out as if it were Valentines day.
Tommy bought 2 bouquets of Roses One for his girlfriend on Valentines day and one for his side piece on side piece day.
by Onblast! February 14, 2011
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Celebrated the day before (February13)or the day after (February15) Valentines day. A day men spend with their side piece as if it was Valentines Day.
I was with my other girl on Side piece Day
by "THAT TRUTH" February 13, 2017
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