yak

Dictionary: yak2  yack (yăk) Slang.

To talk persistently and meaninglessly; chatter.

Prolonged, sometimes senseless talk; chatter.

[Imitative.]

A heavily built mammal, Poephagus grunniens, of the order Artiodactyla that has been domesticated but still exists in the wild state in Tibet and high areas of China, living at elevations of 13,000–20,000 ft (about 4–6 km). It is related to the bison, which it resembles anatomically in having 14 pairs of ribs instead of the 13 pairs more usual of the order. Economically, it is probably the most important animal in Tibet, being used as a beast of burden and for its excellent milk. The dung is used as fuel, the hair is used for making cloth, and the flesh is eaten. Calving occurs in the autumn after a gestation period of about 10 months. See also Artiodactyla; Bison.

verb

To talk volubly, persistently, and usually inconsequentially: babble, blabber, chatter, chitchat, clack, jabber, palaver, prate, prattle, rattle (on), run on. Informal go on, spiel. Slang gab, gas, jaw. Idioms: run off at the mouth, shoot thebreezebull. See words.

noun

Incessant and usually inconsequential talk: babble, blab, blabber, chat, chatter, chitchat, jabber, palaver, prate, prattle, small talk. Slang gab, gas. See words.

The noun has 3 meanings:

Meaning #1: noisy talk
  Synonyms: yack, yakety-yak, chatter, cackle

Meaning #2: a humorous anecdote or remark
  Synonyms: joke, gag, laugh, jest, jape, wheeze

Meaning #3: large long-haired wild ox of Tibet often domesticated
  Synonym: Bos grunniens