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1. jazz mag
(Eng.) Slang term for pornographic literature.
"Gross, you got my jazz mag all wet."
2. Jazz Mag
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"