perivag (pronounced: Perry-vaj. From Middle English. Believed to be derived from "peripheral vagina"): a rare phenomenon that can occur when a woman is lying on her back in a bikini and the little triangle covering her crotch loses its elasticity, unveiling the lady's pubic region.
Not only did I see some sideboob at the beach today, but I also caught some perivag!
by beachguy123 June 20, 2010
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