Gibberish

Part of speech: noun (n.)

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.

Part of speech: adjective (a.)

Unmeaning; as, gibberish language.