Definition of gibbers:
(v) :
To jabber, talk rapidly and unintelligibly or incoherently.
(n) :
Gibberish, unintelligible speech.
(n) :
(Australia) A stone or rock, of chalcedony or similar mineral, found strewn over arid regions of inland Australia; a gibber stone.
(n) :
(Australia, colloquial) Any small rock or stone, especially one used for throwing.
(n) :
A balky horse.
(n) :
(Australia, obsolete) A large boulder or rocky outcrop; also, an overhanging rock formation.