:bang: 1. n. Common spoken name for `!' (ASCII 0100001),
especially when used in pronouncing a {bang path} in spoken
hackish. In {elder days} this was considered a CMUish usage,
with MIT and Stanford hackers preferring {excl} or {shriek};
but the spread of UNIX has carried `bang' with it (esp. via the
term {bang path}) and it is now certainly the most common spoken
name for `!'. Note that it is used exclusively for
non-emphatic written `!'; one would not say "Congratulations
bang" (except possibly for humorous purposes), but if one wanted
to specify the exact characters `foo!' one would speak "Eff oh oh
bang". See {shriek}, {{ASCII}}. 2. interj. An exclamation
signifying roughly "I have achieved enlightenment!", or "The
dynamite has cleared out my brain!" Often used to acknowledge
that one has perpetrated a {thinko} immediately after one has
been called on it.
-- The AI Hackers Dictionary