hacker, n: One who is intensely interested in learning and modifying the technical aspects of a system, particularly a computer and its software; one who hacks; a computer programmer who is largely or completely self-taught.
CWRU Hacker Society is a common ground for those who are interested in digging into the innards of things; for those who use, produce, or support open-source software (or hardware); and for those who would like to learn more about open-source development.