a. Unmeaning; as, gibberish language. [ 1913 Webster ]
n. [ From Gibber, v. i. ] 1. Rapid and inarticulate talk; unintelligible language; unmeaning words. [ 1913 Webster ]
He, like a gypsy, oftentimes would go; All kinds of gibberish he had learnt to know. Drayton. [ 1913 Webster ]
Such gibberish as children may be heard amusing themselves with. Hawthorne. [ 1913 Webster ]
2. Incomprehensible, obscure, or pretentious technical talk or writing; excessively obscure jargon. [ PJC ]