rusty keg Share definition Flag A sexual act in which one person receives a finger in the bum while simultaneously peeing into the stimulator's mouth. Dawg, I got the best Rusty Keg from my girl last night! rusty keg by rusty-rhyno August 21, 2024 0 0 Get merch Get the rusty keg mug. Buy Now — $32.95 See more merch