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blue period

similar to a blue moon (two full moons in the same calendar month), two menstruation periods in the same calendar month.
a blue period is having a menstrual cycle on days 1-8 and 29-4, of the calendar month
blue period by aquadump October 4, 2009

Blue Period

The second period in a month by a woman, named after the "blue moon."
Jeff: Dude, I think she's on her period.
John: Wasn't she on it earlier this month?
Jeff: Uh huh, looks like a blue period.
Blue Period by Psychx October 22, 2012