yatterEnglishOxford New American Dictionaryyatter /ˈyadər, ˈjædər / informal ▸ verb [no object] talk incessantly; chatter: dear old Betty was yattering at me on Sunday. ▸ noun incessant talk: there is no place like home for random yatter. – ORIGIN early 19th century : imitative, perhaps suggested by yammer and chatter.