Source : Free On-Line Dictionary of Computing

brain-damaged
     
        1. [generalisation of "Honeywell Brain Damage" (HBD), a
        theoretical disease invented to explain certain utter
        cretinisms in Honeywell {Multics}] Obviously wrong; cretinous;
        {demented}.  There is an implication that the person
        responsible must have suffered brain damage, because he should
        have known better.  Calling something brain-damaged is really
        bad; it also implies it is unusable, and that its failure to
        work is due to poor design rather than some accident.  "Only
        six monocase characters per file name?  Now *that's*
        brain-damaged!"
     
        2. [especially in the Mac world] May refer to free
        demonstration software that has been deliberately crippled in
        some way so as not to compete with the commercial product it
        is intended to sell.  Synonym {crippleware}.
     
        [{Jargon File}]