derf: /derf/ v.,n. [PLATO] The act of exploiting a terminal
which someone else has absentmindedly left logged on, to use that
person's account, especially to post articles intended to make an
ass of the victim you're impersonating. It has been alleged that
the term originated as a reversal of the name of the gentleman who
most usually left himself vulnerable to it, who also happened to be
the head of the department that handled PLATO at the University of
Delaware.
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