the action of making out in a secret alleyway meshed with the fact of going out of your way to hide the boy/girl from your parents that you’re not allowed to see/spend time with.
Chad: “Dude, I cranked metallica so hard with Brittney last night. It was so lit.”
Jeff: “Woah, what does it mean to ‘crank metallica’”?
Chad: “It means to make out in a secret alleyway, man.”
Jeff: “Woah DUDE! I wish I could have cranked some hard metallica with Jessica at that party last weekend.”
Chad: “Don’t worry bro. You’ll get your chance to crank metallica someday.”
cranking metallica: to make out in secret: specifically in an alleyway