What are they gibbering about now? Calm down! You sound like a gibbering idiot!
Recent Examples on the WebFor a while, police interest bent toward a Phud who had been warned he might be eliminated from the program, who had seemed almost exultant about the fire and gibbered gleefully about the media spotlight.New York Times, 13 Apr. 2018 Or is Tucker Carlson the exact opposite of a journalist and his broadcast the Platonic ideal of gibbering insanity? Amanda Arnold, The Cut, 9 Apr. 2018 Mr. Eno is well aware of such dangers, and of all the other gibbering clichés people are reduced to when contemplating their ultimate ends. Ben Brantley, New York Times, 27 Feb. 2017 In issue two, Chang wanders around gibbering like a raw-meat lunatic while his skin tries to escape the little girl, who's keeping it as a pet. Maurice Martin, WIRED, 1 Mar. 2002