definition of
yak

[1] #1 yak n. [yack, yakety-yak, chatter, cackle] noisy talk. wn

[2] #2 yak v. [gab] talk profusely; "she was yakking away about her grandchildren". wn

[3] #3 yak n. [Bos grunniens] large long-haired wild ox of Tibet often domesticated. wn