Work zombie
An employee who experiences a loss of consciousness that can go on for hours or days. In this state, he or she will have no memory at all of the work he or she performed. Also known as work autopilot and work robot, these are usually people who feel that they have no future in their own company. It is believed that the "lost" time is spent in internal calculation so as not to allow the brain cells to atrophy.
"Jones, you cretin. What were you thinking? Were you paying any attention at all to your work?"
(In a fog) "Sorry boss. I must have become a work zombie. "
(In a fog) "Sorry boss. I must have become a work zombie. "