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This was heavy metal music from the late 80's to the early 90's that was neither heavy, nor really even metal. When it was listened to by men, it was used primarily as an attempt to bring a girl home (and, presumably, into the sheets).

Sheet Metal tapes and CD's were often stashed in the glove compartment when on the road, or in the socks and underwear drawer while at home, and the possession of them was never willingly admitted to fellow dudes.

Examples include Poison, Bon Jovi, Faster Pussycat, Steelheart, et al...
It was always a good plan to keep at least one Sheet Metal tape in the glove box on know, just in case.
by Atomic Honey December 04, 2010
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