Source : Free On-Line Dictionary of Computing

frobnicate
     
        /frob'ni-kayt/ (Possibly from {frobnitz}, and usually
        abbreviated to {frob}, but "frobnicate" is recognised as the
        official full form).  To manipulate or adjust, to {tweak}.
        One frequently frobs bits or other 2-state devices.  Thus:
        "Please frob the light switch" (that is, flip it), but also
        "Stop frobbing that clasp; you'll break it".  One also sees
        the construction "to frob a frob".
     
        Usage: frob, {twiddle}, and {tweak} sometimes connote points
        along a continuum.  "Frob" connotes aimless manipulation;
        "twiddle" connotes gross manipulation, often a coarse search
        for a proper setting; "tweak" connotes fine-tuning.  If
        someone is turning a knob on an oscilloscope, then if he's
        carefully adjusting it, he is probably tweaking it; if he is
        just turning it but looking at the screen, he is probably
        twiddling it; but if he's just doing it because turning a knob
        is fun, he's frobbing it.  The variant "frobnosticate" has
        also been reported.
     
        (1994-12-16)