cum-splash Share definition Flag cum-splash is the part of a guy's cum-shot that splashes back on him when he jacks off in a urinal. I whacked off in one of the cadet urinals this afternoon, and now I've got cum-splash on my uniform! cum-splash by USAF Cadet April 14, 2021 0 0 Get merch Get the cum-splash mug. Buy Now — $32.95 See more merch