DuckCorp Dico

Found one definition

1.                 From The Jargon File (version 4.4.7, 29 Dec 2003):
                   
   
   
                   
                     
   gonk
    /gonk/, vi.,n.
       1. [prob. back-formed from gonkulator.] To prevaricate or to embellish
       the truth beyond any reasonable recognition. In German the term is
       (mythically) gonken; in Spanish the verb becomes gonkar. “You're gonking
       me. That story you just told me is a bunch of gonk.” In German, for
       example, “Du gonkst mich” (You're pulling my leg). See also gonkulator.
       2. [British] To grab some sleep at an odd time; compare gronk out.