Related:

• J. Random Hacker: [MIT] /J rand'm hak'r/ n. A mythical figure like the Unknown Soldie
  he archetypal hacker nerd. See {random}, {Suzie COBOL}....
• J. Random /J rand'm/ n. [common; generalized from J.
  Random Hacker] Arbitrary; ordinary; any one; any old....
• J. Random: /J rand'm/ n. [generalized from {J. Random Hacker}] Arbitrary
  ordinary; any one; any old. `J. Random' is often prefixed to a noun to make a name out of it....
• Fred Foobar n. J. Random Hacker's cousin. Any typical human being, more or less synomous with `someone' except that Fred Foobar can be backreferenced by name later on.
  So Fred Foobar will enter his phone number into the database, and it'll be archived with the others....
• fred: n. 1. The personal name most frequently used as a {metasyntactic variable} (see {foo}).
  Allegedly popular because it's easy for a non-touch-typist to type on a standard QWERTY keyboard....
• fred n. 1. The personal name most frequently used as a metasyntactic variable (see foo).
  Allegedly popular because it's easy for a non-touch-typist to type on a standard QWERTY keyboard....
• foobar n. [very common] Another widely used metasyntactic variable
  ee foo for etymology. Prob originally propagated through DECsystem manuals by Digital Equipment Corporation (DEC) in 1960s and early 1970...
• JR[LN]: /J-R-L/, /J-R-N/ n. The names JRL and JRN were sometimes used as example names when discussing a kind of user ID used under {{TOPS-10}} and {WAITS}
  hey were understood to be the initials of (fictitious) programmers named `J....
• 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....