What is the meaning of Gibber?

Gibberish, unintelligible speech.

To jabber, talk rapidly and unintelligibly or incoherently.

A stone or rock, of chalcedony or similar mineral, found strewn over arid regions of inland Australia; a gibber stone.

Any small rock or stone, especially one used for throwing.

A large boulder or rocky outcrop; also, an overhanging rock formation.

A balky horse.

humpbacked, hunchbacked

a hump, hunch on the back

Source: wiktionary.org