drop an egg:

To begin menstruating. See menstruation for synonyms.
See Also: acrosomal reaction, acrosome reaction, backs against the wall!, backs to the wall chaps!, bird's eggs, butter and eggs, drop anchor down the booby hutch, drop anchor in the bubby hutch, drop beads, drop one's beads, drop one's cookies, drop ones load, drop the plate, egg McMuff, egg McMuffin, impregnation, jilt, lemon, morning dew drop, morning drip, oviduct, pearl drop, shell-like

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