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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