yammer

intransitive verb

1. to whine, whimper, or complain
2. to shout, yell, clamor, etc.
3. to talk loudly or continually

Etymology: ME yameren < OE geomerian, to lament, groan < geomor, sad, mournful, wretched: infl. by MDu & MLowG jammeren, of echoic orig.

transitive verb

to say loudly and fretfully

noun

the act of yammering, or something yammered