An Ignorant Operator of a computer. See id10t
Meant to be confused with the more traditional Input-Output Error
Tech to the person who doesn't have a clue about computers but insists in sitting at a keyboard anyway.
" the reason the computer couldn't do that was an I/O Error"
Idiot Operator error.
Some guy called asking for help since his computer wouldn't turn on. Turns out he had an I/O error, he hadn't plugged in the fucking computer.