Definition of yammer verb from the Oxford Advanced American Dictionary

 

yammer

 verb
verb
NAmE//ˈyæmər//
 
[intransitive]yammer (on/away) (about something)(informal)Verb Forms present simple I / you / we / they yammer he / she / it yammers past simple yammered -ing form yammering
 
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to talk continuously, especially in an annoying way He was yammering on about his new job.