There are 2 definitions of gibber in English:

gibber1

Line breaks: gib¦ber
Pronunciation: /ˈdʒɪbə
 
/

verb

[no object]
Speak rapidly and unintelligibly, typically through fear or shock: they shrieked and gibbered as flames surrounded them (as adjective gibbering) a gibbering idiot
More example sentences
  • Somehow, it left me almost gibbering with fear.
  • By this stage I wasn't babbling, more like gibbering.
  • The day will come, soon enough, when I'm gibbering, and incoherent, but right now I'm in control and I don't want anyone else to know.
Synonyms
prattle, rattle on, chatter, babble, ramble, drivel, jabber, patter, gabble, bumble, burble, twitter, flannel, go on, run on, mutter, mumble, maunder, prate, bleat, cackle; Scottish & Irishslabber
British informal witter, rabbit, chunter, waffle
North American informal run off at the mouth
Australian/New Zealand informal mag
archaic clack, twaddle, twattle

Origin

early 17th century: imitative.

Definition of gibber in:

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Word of the day hubris
Pronunciation: ˈhjuːbrɪs
noun
excessive pride or self-confidence

There are 2 definitions of gibber in English:

gibber2

Line breaks: gib¦ber
Pronunciation: /ˈɡɪbə
 
/
(also gibber stone)

noun

Australian
1A stone or boulder forming part of a boulder plain.
More example sentences
  • We're standing on a desert rise six kilometres north of town overlooking a sea of shining gibbers.
1.1Any small stone.

Origin

from Dharuk giba 'stone'.

Definition of gibber in:

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Word of the day hubris
Pronunciation: ˈhjuːbrɪs
noun
excessive pride or self-confidence