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Definition 2024

yack ‎(plural yacks)

yack ‎(third-person singular simple present yacks, present participle yacking, simple past and past participle yacked)

(slang) to vomit, usually because of intoxication
(colloquial) to talk incessantly
I moved to another carriage on the train because the first one was full of people yacking on mobile phones.

From Tibetan གཡག ‎(g.yag), from Proto-Sino-Tibetan *g-jak ~ g-jaŋ.

yack m ‎(plural yacks)