[Abbrev., "Problem Exists Between Keyboard And Chair"] Used by
support people, particularly at call centers and help desks. Not
used with the public. Denotes pilot error as the cause of the
crash, especially stupid errors that even a luser could figure out. Very derogatory. Usage:
"Did you ever figure out why that guy couldn't print?" "Yeah, he
kept cancelling the operation before it could finish.
PEBKAC."