sub. (school).—The conventional school study and use of the French language: hence, as verb = to speak French; to talk gibberish.

1

  1837.  R. H. BARHAM, The Ingoldsby Legends, ‘The Bagman’s Dog.’ Grimacing, and what sailors call PARLEY-VOOING.

2

  1843.  MACAULAY, St. Dennis and St. George. He kept six French masters to teach him PARLEYVOO.

3

  d. 1891.  J. R. LOWELL, The Oracle of the Goldfishes.

        No words to spell, no sums to do,
No Nepos and no PARLYVOO!

4