Dictionaries:

flag day:

To be menstruating. See menstruation for synonyms.
See Also: 24/7/365, baker flying, bloody red flag is up, the, BVDs, CFD, Disneyland daddy, Doering Rule, dog days, flying the red flag, menstruation, nine-to-fiver, poke party, queen for a day, red flag, the, Saint Valentine's Day, wet day, whoring days

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