Definitions from Wiktionary ( )

▸ verb:  (intransitive) To complain peevishly.
▸ verb:  (intransitive) To talk loudly and persistently.
▸ verb:  (transitive) To repeat on and on, usually loudly or in complaint.
▸ verb:  (intransitive, rare) To make an outcry; to clamor.
▸ verb:  (intransitive) to repeatedly call someone's name.
▸ noun:  The act or noise of yammering.
▸ noun:  A loud noise.
▸ noun:  One who yammers.

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