Source : Webster's Revised Unabridged Dictionary (1913)

Gibberish \Gib"ber*ish\, n. [From {Gibber}, v. i.]
   Rapid and inarticulate talk; unintelligible language;
   unmeaning words; jargon.

         He, like a gypsy, oftentimes would go; All kinds of
         gibberish he had learnt to known.        --Drayton.

         Such gibberish as children may be heard amusing
         themselves with.                         --Hawthorne.

Gibberish \Gib"ber*ish\, a.
   Unmeaning; as, gibberish language.

Source : WordNet®

gibberish
     n : unintelligible talking [syn: {gibber}]