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Sanitary towel, used by menstruating females. Jam = blood, + rag.

Cognate with 'on the rag': menstruating.
She needed to change her jamrag.
by starflier December 08, 2003
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Sanitary Napkins, used by women during menstruation. These of are often disposed of into a container next to the water closet, they are often fall into the hands of a pedal bin vampire.
Sandra applied the jam rag to her vulva, since her menstrual flow was heavy, and chewy bits were abundant.
by Clinton Sounds February 04, 2004
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An insult.

A 'jam rag' defined would be a piece of cloth used to absorb blood from the menstrul cycle.

Ergo, the person the insult is fired at is the rag.
You fucking jam rag!
by Maryy November 27, 2007
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