Source : Free On-Line Dictionary of Computing

killer micro
     
        [Popularised by Eugene Brooks] A {microprocessor}-based
        machine that infringes on mini, mainframe, or supercomputer
        performance turf.  Often heard in "No one will survive the
        attack of the killer micros!", the battle cry of the
        downsizers.  Used especially of {RISC} architectures.
     
        The popularity of the phrase "attack of the killer micros" is
        doubtless reinforced by the movie title "Attack Of The Killer
        Tomatoes" (one of the {canonical} examples of
        so-bad-it's-wonderful among hackers).  This has even more
        flavour now that killer micros have gone on the offensive not
        just individually (in workstations) but in hordes (within
        {massively parallel computer}s).
     
        [{Jargon File}]