Gibberish is a generic term in English

English language

English is a West Germanic language that arose in the Anglo-Saxon kingdoms of England and spread into what was to become south-east Scotland under the influence of the Anglian medieval kingdom of Northumbria...

 for talking that sounds like speech

Speech

Speech is the human faculty of speaking.It may also refer to:* Public speaking, the process of speaking to a group of people* Manner of articulation, how the body parts involved in making speech are manipulated...

, but carries no actual meaning. This meaning has also been extended to meaningless text or gobbledygook

Gobbledygook

Gobbledygook or gobbledegook is any text containing jargon or especially convoluted English that results in it being excessively hard to understand or even incomprehensible...

. The common theme in gibberish statements is a lack of literal sense, which can be described as a presence of nonsense. One of the more famous examples of using gibberish in literature is the poem "Jabberwocky

Jabberwocky

"Jabberwocky" is a nonsense verse poem written by Lewis Carroll in his 1872 novel Through the Looking-Glass, and What Alice Found There, a sequel to Alice's Adventures in Wonderland...

" by Lewis Carroll

Lewis Carroll

Charles Lutwidge Dodgson , better known by the pseudonym Lewis Carroll , was an English author, mathematician, logician, Anglican deacon and photographer. His most famous writings are Alice's Adventures in Wonderland and its sequel Through the Looking-Glass, as well as the poems "The Hunting of the...

.
One etymology

Etymology

Etymology is the study of the history of words, their origins, and how their form and meaning have changed over time.For languages with a long written history, etymologists make use of texts in these languages and texts about the languages to gather knowledge about how words were used during...

 asserts it is derived from the root of the Irish

Irish language

Irish , also known as Irish Gaelic, is a Goidelic language of the Indo-European language family, originating in Ireland and historically spoken by the Irish people. Irish is now spoken as a first language by a minority of Irish people, as well as being a second language of a larger proportion of...

 word gob or gab (mouth), which the same source asserts is the root of jabber, gibber and gobble.