Dopplebang Share definition Flag (v.) To have sex with your doppleganger, past or future self, or someone who looks alarmingly similar to you (i.e. your twin) I totally fucked up the time space continuum when i went back in time and dopplebanged myself. Dopplebang by BrooklynTrees May 5, 2012 0 0 Get merch Get the Dopplebang mug. Buy Now — $32.95 See more merch