Jack In Meaning

(science fiction) To connect a brain directly to a computer.

Example:   I've had enough of working nights, so I'm going to jack in my job.
  I'm going to jack my job in.
1970 June, Silverberg, Robert, “The Tower of Glass”, Galaxy Science Fiction, volume 30, page 141:
  Watchman replaced him in the linkup seat. He jacked himself into the computer.
1986, William Gibson, “Winter Market”, in Burning Chrome, page 129:
  She couldn't move, not without that extra skeleton, and it was jacked straight into her brain, myoelectric interface.