buag

from Jargon File (4.4.4, 14 Aug 2003)
BUAG
 //, n.

   [abbreviation, from alt.fan.warlord] Big Ugly ASCII Graphic.
   Pejorative term for ugly {ASCII art}, especially as found in {sig
   block}s. For some reason, mutations of the head of Bart Simpson are
   particularly common in the least imaginative {sig block}s. See
   {warlording}.
    
from The Free On-line Dictionary of Computing (8 July 2008)
BUAG

   [alt.fan.warlord] Big Ugly ASCII Graphic.  Pejorative term for
   ugly {ASCII ART}, especially as found in {sig blocks}.  For
   some reason, mutations of the head of Bart Simpson are
   particularly common in the least imaginative {sig blocks}.

   See {warlording}.
    

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