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2 definitions found

From Webster's Revised Unabridged Dictionary (1913) [web1913]:

  Derf \Derf\, a. [Icel. djafr.]
     Strong; powerful; fierce. [Obs.] -- {Derf"ly}, adv. [Obs.]

From Jargon File (4.3.1, 29 Jun 2001) [jargon]:

  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. Compare
     {baggy pantsing}.
  
  

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