It's ...er... a genre term for all that sleazy rock 'n' roll and jazz that you can find on the likes of the Las Vegas Grind series, etc. I love that stuff!
A fuller definition here. -Possibly not safe for work, etc.
oh dear
the feminist half of me is screaming 'exploitation'
meanwhile, the sleazy dyke half of me is screaming 'phwoarr', 'gerrinnn', 'look at the knockers on that', and other such unreconstructed linguistic terms