The act of typing when experiencing extreme exhaustion. The text produced in this state is typically nonsensical and unorganized, often ending in a random assortment of letters when the typist finally passes out at the keyboard.
It is not unusual for those experiencing zombie typing to have no memory of the act.
'what sh*t were you on last night man? on facebook you asked me if I'd ever scissored with my iguana...'
'wtf really?! sorry man, I must have been zombie typing'