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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  (4.2.3,  23  NOV  2000)  [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.