qux

from Jargon File (4.4.4, 14 Aug 2003)

qux
 /kwuhks/

   The fourth of the standard {metasyntactic variable}, after {baz} and
   before the quu(u...)x series. See {foo}, {bar}, {baz}, {quux}. This
   appears to be a recent mutation from {quux}, and many versions
   (especially older versions) of the standard series just run {foo},
   {bar}, {baz}, {quux}, ....

from The Free On-line Dictionary of Computing (8 July 2008)

qux

   /kwuhks/ The fourth of the standard {metasyntactic variable},
   after {baz} and before the quu(u...)x series.  See {foo},
   {bar}, {baz}, {quux}.  This appears to be a recent mutation
   from {quux}, and many versions (especially older versions) of
   the standard series just run {foo}, {bar}, {baz}, {quux}, ...

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