Source : Webster's Revised Unabridged Dictionary (1913)

Jabber \Jab"ber\, v. i. [imp. & p. p. {Jabbered}; p. pr. & vb.
   n. {Jabbering}.] [Cf. {Gibber}, {Gabble}.]
   To talk rapidly, indistinctly, or unintelligibly; to utter
   gibberish or nonsense; to chatter. --Swift.

Source : WordNet®

jabbering
     adj : talking idly or incoherently; "blithering (or blathering)
           idiot"; "jabbering children"; "gabbling housewives"; "a
           babbling hospital inmate" [syn: {blathering}, {blithering},
            {babbling}]
     n : rapid and indistinct speech [syn: {jabber}, {gabble}]