Entry 2 senses · 2 variants Webster, 1913 Gibber /(jĭb"bẽr)/ · Gib·ber · IPA /ˈd͡ʒɪbə(ɹ)/ n. v. i. 01 n. A balky horse. 1. A balky horse. 02 v. i. To speak rapidly and inarticulately. imp. & p. p. gibbered; p. pr. & vb. n. gibbering 1. To speak rapidly and inarticulately. Syn. jabber.