yak /jæk/noun 8verb 2forms 3 noun8 •An ox-like mammal native to the Himalayas, Mongolia, Myanmar, and Tibet with dark, long, and silky hair, a horse-like tail, and a full, bushy mane. •(slang) A talk, particular an informal talk; chattering; gossip.Sluggsy said indifferently, ‘You’ll be wised up come morning. Meanwhiles, howsabout shuttin’ that dumb little hashtrap of yours? All this yak is bending my ear. I want some action. — 1962 •(slang) A laugh.Would-be gags from would-be gagsters. And, nine chances out of ten, not a yak in the lot. — 1951 •[in the plural] (slang) A yakuza member.Yakuza, or Yaks as they are popularly known, Japan's large and tightly organized crime and illicit drug corporations. — 2007 •(slang) cognac.Quick cash, flip that, now I got big cash. Sit back, sip yak with a next piff yat. — 2018 •(slang) A kayak. •(slang) Vomit. •a traditional Korean flute used in court music verb2 •(slang) To talk, particularly informally but persistently; to chatter or prattle.And in the last few days Clair's boundless capacity to yak about herself while Melissa listened had turned Chip against her, too. — 2001 •(slang) To vomit, usually as a result of excessive alcohol consumption.She'll feel better when she yaks. — 1998 formsyakked · yakking · yaks