Related:

• bar /bar/ n. 1. [very common] The second metasyntactic variable, after foo and before .
  ..." 2. Often appended to foo to produce foobar....
• baz: /baz/ n. 1. The third {metasyntactic variable} "Suppose we have three functio
  FOO, BAR, and BAZ. FOO calls BAR, which calls BAZ....
• baz /baz/ n. 1. [common] The third metasyntactic variable "Suppose we have three functio
  F FOO calls BAR, which calls BAZ...." (See also fum) 2....
• 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}, ....
• fum: [XEROX PARC] n. At PARC, often the third of the standard {metasyntactic variable}s (after {foo} and {bar}).
  Competes with {baz}, which is more common outside PARC. -- The AI Hackers Dictionary...
• ((lambda (foo) (bar foo)) (baz))
• qux /kwuhks/ The fourth of the standard metasyntactic variable
  after baz foo, bar, baz, quux quux, and many versions (especially older versions) of the standard series just run foo, bar, baz, quux, ....
• hud: n. 1. Yet another {metasyntactic variable} (see {foo}).
  It is reported that at CMU from the mid-1970s the canonical series of these was `foo', `bar', `thud', `blat'....
• metasyntactic variable n. A name used in examples and understood to stand for whatever thing is under discussion, or any random member of a class of things under discussion.
  The word foo is the canonical example. To avoid confusion, hackers never (well, hardly ever) use `foo' or other words like it as permanent names for anything....