yammer
verb
[ ˈjamə ]
• talk foolishly or incessantly.
• "he was yammering on as if he had an enthralled audience at his feet"
yammer
noun
• foolish or incessant talk.
• "the look on his face stopped Bob's nervous yammer"
Origin:
late Middle English (as a verb meaning ‘lament, cry out’): alteration of earlier yomer, from Old English geōmrian ‘to lament’, suggested by Middle Dutch jammeren .