gibberish

Short definition from Wiktionary

Noun

1. 1
   Speech or writing that is unintelligible, incoherent or meaningless.
2. 2
   Needlessly obscure or overly technical language.
3. 3
   A language game, comparable to pig Latin, in which one inserts a nonsense syllable before the first vowel in each syllable of a word.

Adjective

1. 1
   unintelligible, incoherent or meaningless