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biff /bif/ vt.
 To notify someone of incoming mail.  From
   the BSD utility biff(1), which was in turn named after a
   friendly dog who used to chase frisbees in the halls at
   UCB while 4.2BSD was in development.  There was a legend that it
   had a habit of barking whenever the mailman came, but the author of
   biff says this is not true.  No relation to B1FF.
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