The Collaborative International Dictionary of English v.0.48:

Collogue \Col*logue"\, v. i. [Cf. L. colloqui and E. dialogue.
   Cf. Collocution.]
   To talk or confer secretly and confidentially; to converse,
   especially with evil intentions; to plot mischief. [Archaic
   or Colloq.]
   [1913 Webster]

         Pray go in; and, sister, salve the matter,
         Collogue with her again, and all shall be well.
                                                  --Greene.
   [1913 Webster]

         He had been colloguing with my wife.     --Thackeray.
   [1913 Webster]

WordNet (r) 3.0 (2006):

collogue
    v 1: confer secretly