Source : Free On-Line Dictionary of Computing

Luser Attitude Re-adjustment Tool
     
         (LART) Something large, heavy and painful, used to
        respond appropriately to particularly annoying {lusers}.
     
        The alt.sysadmin.recovery {FAQ} recommends the following
        LARTs.  A 2x4 works fine, but a real professional needs
        something a little more effective.  Unfortunately, this is a
        very personal thing, and no consensus has yet been reached on
        the group.  Everything from a simple, 7.65mm Walther (for the
        Bond fans only, it's not a very good gun) to a 155mm with
        depleted Uranium rounds has been suggested, some even going
        for exotic things like Thermite, nukes or flamethrowers.  For
        further info, look at the rec.guns home page.
     
        {alt.sysadmin.recovery FAQ
        (http://www.ctrl-c.liu.se/~ingvar/asr/overview.html)}.
     
        (1998-12-09)