Cyborks
Cyborks're quite simply Ork cyborgs, like Imperial Servitors but with their mental faculties (such as they are) fully intact.
3rd Edition was the golden age of Orky research into this branch of the tech tree, with Cyborks available as a unit choice, Bionik Bonces, Arms, and even full Cybork Bodies readily available on the free market, and even Cyboar mounts. This period of rampant innovation was probably spurred on by Painbosses being HQ choices at the time, and thus having the authority to splurge on their pet projects to their hearts' content.