rubber ball gag Share definition Flag a sex toy in which the person who's mouth it is in can't scream or say anything I let my girlfriend use a rubber ball gag on me, so when I'm in pain I can't scream. rubber ball gag by Semper Fidelis November 9, 2007 0 0 Get merch Get the rubber ball gag mug. Buy Now — $32.95 See more merch