Englishgibber
verb
what are you gibbering about?:
prattle, rattle on, chatter, babble, ramble, drivel, jabber, patter, gabble, bumble, burble, twitter, go on, run on, mutter, mumble, maunder, prate, bleat, cackle;
Scottish, & Irish slabber;
informal gab, yak, yap, yackety-yak, yabber, yatter, natter, yammer, blabber, jibber-jabber, blather, blether, blither, jaw, gas, shoot one's mouth off;
British, informal witter, rabbit, chunter, waffle, flannel;
North American, informal run off at the mouth;
Australian, New Zealand, informal mag;
archaic clack, twaddle, twattle.
gibber (1) Oxford Dictionary of English