cocked and locked means: A pistol that is locked and locked means it has a cartridge in its chamber, and the hammer is cocked back ready for firing. Police officers who use 1911 pistols this way invented the term. The holster strap, usually placed between the firing pin and hammer for safety, is then opened for quick draw. You can safely carry a 1911 pistol this way due to redundant safety features such as the thumb safety and grip safety. This protects against accidental discharge and keeps the gun on target until it is fired. (in Community Dictionary, added by Elisa Kent)