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A specialist gentleman's publication often enjoyed lying down with the curtains closed.
Father: "There's a lot of banging going on upstairs, where's young Steven?"

Mother: "He's in his room, reading"

Father: "Hm, he's probably looking at a Jazz Mag"

Mother: "Good gracious no, he's not that kind of boy. He's probably just exercising, and he's never liked Jazz music"
by Chris S - Mcr April 01, 2009
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Magazines that contain images of the female species in various states of undress.

In some cases these images include red jacket shots
"Oh bollocks Dad, have you been borrowing my jazz mags again"
by Marko The Great September 07, 2004
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