The Jargon File (version 4.4.7, 29 Dec 2003):
double bucky
 adj.
    Using both the CTRL and META keys. ?The command to burn all LEDs is double
    bucky F.?
    This term originated on the Stanford extended-ASCII keyboard, and was later
    taken up by users of the space-cadet keyboard at MIT. A typical MIT
    comment was that the Stanford bucky bits (control and meta shifting keys)
    were nice, but there weren't enough of them; you could type only 512
    different characters on a Stanford keyboard. An obvious way to address this
    was simply to add more shifting keys, and this was eventually done; but a
    keyboard with that many shifting keys is hard on touch-typists, who don't
    like to move their hands away from the home position on the keyboard. It
    was half-seriously suggested that the extra shifting keys be implemented as
    pedals; typing on such a keyboard would be very much like playing a full
    pipe organ. This idea is mentioned in a parody of a very fine song by
    Jeffrey Moss called Rubber Duckie, which was published in The Sesame Street
    Songbook (Simon and Schuster 1971, ISBN 0-671-21036-X). These lyrics were
    written on May 27, 1978, in celebration of the Stanford keyboard:
    Double Bucky
    Double bucky, you're the one!
    You make my keyboard lots of fun.
        Double bucky, an additional bit or two:
    (Vo-vo-de-o!)
    Control and meta, side by side,
    Augmented ASCII, nine bits wide!
        Double bucky!  Half a thousand glyphs, plus a few!
    Oh,
    I sure wish that I
    Had a couple of
        Bits more!
    Perhaps a
    Set of pedals to
    Make the number of
        Bits four:
    Double double bucky!
    Double bucky, left and right
    OR'd together, outta sight!
        Double bucky, I'd like a whole word of
        Double bucky, I'm happy I heard of
        Double bucky, I'd like a whole word of you!
    ? The Great Quux (with apologies to Jeffrey Moss)
    [This, by the way, is an excellent example of computer filk ?ESR] See
    also meta bit, cokebottle, and quadruple bucky.
The Free On-line Dictionary of Computing (30 December 2018):
double bucky
   Using both the CTRL and META keys.  "The command to burn all
   LEDs is double bucky F."
   This term originated on the Stanford extended-ASCII keyboard,
   and was later taken up by users of the space-cadet keyboard
   at MIT.  A typical MIT comment was that the Stanford bucky
   bits (control and meta shifting keys) were nice, but there
   weren't enough of them; you could type only 512 different
   characters on a Stanford keyboard.  An obvious way to address
   this was simply to add more shifting keys, and this was
   eventually done; but a keyboard with that many shifting keys
   is hard on touch-typists, who don't like to move their hands
   away from the home position on the keyboard.  It was
   half-seriously suggested that the extra shifting keys be
   implemented as pedals; typing on such a keyboard would be very
   much like playing a full pipe organ.  This idea is mentioned
   in a parody of a very fine song by Jeffrey Moss called "Rubber
   Duckie", which was published in "The Sesame Street Songbook"
   (Simon and Schuster 1971, ISBN 0-671-21036-X).  These lyrics
   were written on May 27, 1978, in celebration of the Stanford
   keyboard:
                     Double Bucky
     Double bucky, you're the one!
     You make my keyboard lots of fun.
         Double bucky, an additional bit or two:
     (Vo-vo-de-o!)
     Control and meta, side by side,
     Augmented ASCII, nine bits wide!
         Double bucky!  Half a thousand glyphs, plus a few!
             Oh,
             I sure wish that I
             Had a couple of
                 Bits more!
             Perhaps a
             Set of pedals to
             Make the number of
                 Bits four:
             Double double bucky!
     Double bucky, left and right
     OR'd together, outta sight!
         Double bucky, I'd like a whole word of
         Double bucky, I'm happy I heard of
         Double bucky, I'd like a whole word of you!
     - The Great Quux
   (With apologies to Jeffrey Moss.  This, by the way, is an
   excellent example of computer filk --- ESR).
   See also meta bit, cokebottle, and quadruple bucky.
   [Jargon File]
   (1994-12-07)