The Jargon File (version 4.4.7, 29 Dec 2003):

B1FF
 /bif/, BIFF, n.

    The most famous pseudo, and the prototypical newbie. Articles from B1FF
    feature all uppercase letters sprinkled liberally with bangs, typos, ?cute?
    misspellings (EVRY BUDY LUVS GOOD OLD BIFF CUZ K??L DOOD AN HE RITES REEL
    AWESUM THINGZ IN CAPITULL LETTRS LIKE THIS!!!), use (and often misuse) of
    fragments of talk mode abbreviations, a long sig block (sometimes even
    a doubled sig), and unbounded naivete. B1FF posts articles using his
    elder brother's VIC-20. B1FF's location is a mystery, as his articles
    appear to come from a variety of sites. However, BITNET seems to be the
    most frequent origin. The theory that B1FF is a denizen of BITNET is
    supported by B1FF's (unfortunately invalid) electronic mail address:
    B1FF@BIT.NET.

    [1993: Now It Can Be Told! My spies inform me that B1FF was originally
    created by Joe Talmadge , also the author of the infamous
    and much-plagiarized ?Flamer's Bible?. The BIFF filter he wrote was later
    passed to Richard Sexton, who posted BIFFisms much more widely. Versions
    have since been posted for the amusement of the net at large. See also 
    Jeff K. ?ESR]


The Free On-line Dictionary of Computing (30 December 2018):

BIFF
B1FF

   /bif/ (Or "B1FF", from Usenet) The most famous pseudo, and
   the prototypical newbie.  Articles from BIFF are
   characterised by all uppercase letters sprinkled liberally
   with bangs, typos, "cute" misspellings (EVRY BUDY LUVS GOOD
   OLD BIFF CUZ HE'S A K00L DOOD AN HE RITES REEL AWESUM THINGZ
   IN CAPITULL LETTRS LIKE THIS!!!), use (and often misuse) of
   fragments of chat abbreviations, a long sig block
   (sometimes even a doubled sig), and unbounded naivete.  BIFF
   posts articles using his elder brother's VIC-20.  BIFF's
   location is a mystery, as his articles appear to come from a
   variety of sites.  However, BITNET seems to be the most
   frequent origin.  The theory that BIFF is a denizen of BITNET
   is supported by BIFF's (unfortunately invalid) electronic
   mail address: .

   [1993: Now It Can Be Told!  My spies inform me that BIFF was
   originally created by Joe Talmadge , also the
   author of the infamous and much-plagiarised "Flamer's Bible".
   The BIFF filter he wrote was later passed to Richard Sexton,
   who posted BIFFisms much more widely.  Versions have since
   been posted for the amusement of the net at large. - ESR]

   [Jargon File]

   (1997-09-22)