Rusty Lock Share definition Flag When a guy is having anal sex with a girl and there is another guy having anal sex with him at the same time. Man, the other night Ron and Yonnie gave Kassandra a hard Rusty Lock. Rusty Lock by G-Rad January 16, 2008 0 0 Get merch Get the Rusty Lock mug. Buy Now — $32.95 See more merch