fly the red flag:

To be menstruating. See menstruation for synonyms.
See Also: back-alley, baker flying, bloody flag is up, the, bloody red flag is up, the, Button your arse!, carrot head, carrot top, fly, flying the red flag, go down the line, menstruation, red baron, red flag, the, shop door, tail over the dashboard, Turkish medal, Virginia Maylips, whore's color, zipper morals

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