Sergeant Slapnuts Share definition Flag A person who open-handedly slaps your ballsack when you are not looking. Sergeant Slapnuts nailed Dweazy square in his ballbag causing him to writhe in pain. Sergeant Slapnuts by Phartman March 18, 2011 0 0 Get merch Get the Sergeant Slapnuts mug. Buy Now — $32.95 See more merch