1 definition by girlsetsfire

whereas the "rag" originally referred to the maxi pad used when a woman is on her period, "on the rag" is now used generally to mean having/being on your period, whether or not one uses a maxi pad.
girl 1: What's with the mood swings?
girl 2: She's on the rag.
by girlsetsfire March 3, 2005
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