tumblejunk Share definition Flag Physically damaged scrotum and/or penis owing to self-induced acceleration and deceleration injuries, generally repetitive. I have acute tumblejunk from an ill-advised jockless marathon Zoomba sesh. tumblejunk by LandSailer October 12, 2012 0 0 Get merch Get the tumblejunk mug. Buy Now — $32.95 See more merch