house wizard (Probably from ad-agency tradetalk, "house freak") A hacker occupying a technical-specialist, R&D, or systems position at a commercial shop. A really effective house wizard can have influence out of all proportion to his/her ostensible rank and still not have to wear a suit. Used especially of {Unix} {wizard}s. The term "house guru" is equivalent. [{Jargon File}] (1995-02-16)