Sternum screw Share definition Flag Also known as a "titty fuck", while the man thrusts between the woman's boobs he is grinds her chest (sternum). I loved a good sternum screw. Her tits were so big and juicy. Sternum screw by Gwuthie August 4, 2021 0 0 Get merch Get the Sternum screw mug. Buy Now — $32.95 See more merch