Your catch rag that you turn to after a lonely night of jacking off five times. Never washed, it is discarded only after it has become too stiff and jagged that it causes brutal injury when fornicated with.
Cheryl vomited when she found Jake's spirit rag. He said he wouldn't have one if she swallowed more often.
A person who does not mind, or infact prefers sexual intercourse with a woman who is currently using a 'jam rag' (sanitary towel).
The jam rag may be moved to the side during the act, or a male with a specific fetish might simply abraise their member against the padded liner for one-sided pleasure.
It is un-usual for the female to be aroused during this manoeuvre but not un-heard of.
Johny: Emma's experiencing her time of the month.
Jimmy: Then why are you smiling?
Johny: Because I'm gonna rub my knob against her jam rag tonight!
Jimmy: OMG You're such a Jam Rag Joyrider mate... Jog on!