Holy Roller
         n 1: a member of a religion that expresses ecstatic fervor

English Dictionary: hell erleuchtet sein	by the DICT Development Group
From Jargon File (4.2.0, 31 JAN 2000) [jargon]:
hello world interj.   1. The canonical minimal test message in    the C/Unix universe.   2. Any of the minimal programs that emit this    message.   Traditionally, the first program a C coder is supposed to    write in a new environment is one that just prints "hello, world" to    standard output (and indeed it is the first example program in    {K&R}).   Environments that generate an unreasonably large executable    for this trivial test or which require a {hairy} compiler-linker    invocation to generate it are considered to {lose} (see {X}).   3.    Greeting uttered by a hacker making an entrance or requesting    information from anyone present.   "Hello, world!   Is the LAN back up    yet?"
From The Free On-line Dictionary of Computing (15Feb98) [foldoc]:
hello, world          The canonical minimal test message in the {C}/{Unix} universe       or any of the minimal programs that emit this message.       Traditionally, the first program a C coder writes in a new       environment is one that just prints "hello, world" to standard       output (and indeed it is the first example program in {K&R}).       Environments that generate an unreasonably large executable       for this trivial test or which require a {hairy}       compiler-linker invocation to generate it are considered bad       (see {X}).