The Collaborative International Dictionary of English v.0.48:

Jargon \Jar"gon\ (j[aum]r"g[o^]n), v. i. [imp. & p. p.
   Jargoned (-g[o^]nd); p. pr. & vb. n. Jargoning.]
   To utter jargon; to emit confused or unintelligible sounds;
   to talk unintelligibly, or in a harsh and noisy manner.
   [1913 Webster]

         The noisy jay,
         Jargoning like a foreigner at his food.  --Longfellow.
   [1913 Webster]