[abbreviation, from 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.
ig block: /sig blok/ [UNIX; often written `.sig' there] n.
Short for `signature', used specifically to refer to the
electronic signature block that most UNIX mail- and news-posting
software will {automagically} append to outgoing mail and news....