doppelbang (v.): to intentionally get a girl so drunk that she has sex with you because she confuses you with her boyfriend
Michele: "Yo, how did Bill manage to fuck Molly at that kegger when her boyfriend went to the bathroom?"
Michael: "He totally doppelbanged her!"
friend 2: "um, she's looks exactly like you."
friend 1: "what's wrong with that?"
friend 2: "it just means that you're a total doppelbanger, that's all."
Generally a doppelbanger is created on accident, but there are certain people who try to copy artists and songs on purpose. These knock off songs are intentionally made, so they're not doppelbangers. They're clones. And no one likes a clone.
J: Yeah but dude it's totally a doppelbanger of Haggard by Getter.
C: What? It sounds nothing like it.
J: Dude listen to them both. You're fucking stupid if you think they don't sound alike.