The result of having sex with a woman whilst unaware that she is on her period; though she may or may not be aware of the fact.
person 1: Man, my boxers are covered in Vag Shrapnel.
person 2: Did she know she was on her period?
person 1: She laughed when i noticed...
person 2: Wicked.
by luyox November 15, 2009
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