Excited way to dictate a second serving of sex from a particular woman. Such as seeing a one night stand at a party several days, weeks, or even months later, to have sex with her again would be a 'bangarang.'
Joe: "Hey Mitch, you remember that girl Kelly I had sex with?"
Mitch: "Yeah man the hot one from that party two weeks ago?"
Mitch: "No way! Props dude!"