Definition of "yak"

Utilization efficiency of dietary protein in the yak differs with diet composition and feeding level, age, sex, body condition score, and animal production level (e.g., growth, lactation). Researchers reported no difference between lactating and dry cows in crude protein digestibility, although lactating yak tend to consume more feed than dry yak.

2008, Scott R. R. Haskell, Blackwell's Five-Minute Veterinary Consult: Ruminant, John Wiley & Sons, page 619

Attempts are now being made, by selection, to create a new breed of yak (the Datong yak) from such crosses. Hybridization of domestic yak with local cattle, at intermediate elevations, has been practiced for generations. The hybrids inherit some of the good characteristics from each species, but lack the adaptation of the yak to the harsh conditions at higher elevations.

2004, Wilson G. Pond, Encyclopedia of Animal Science (Print), CRC Press, page 899

“You'll like Poppet. Nice dog. Wears his ears inside out. Why do dachshunds wear their ears inside out?” “I could not say, sir.” “Nor me. I've often wondered. But this won't do, Jeeves. Here we are, yakking about Jezebels and dachshunds, when we ought to be concentrating our minds […]

1960, P. G. Wodehouse, chapter XI, in Jeeves in the Offing

And in the last few days Clair's boundless capacity to yak about herself while Melissa listened had turned Chip against her, too.

2001, Jonathan Franzen, The Corrections

She'll feel better when she yaks.

1998, Tim Herlihy, The Wedding Singer, spoken by Glenn Guglia (Matthew Glave)

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, Ian Fleming, chapter 9, in The Spy Who Loved Me

The sudden head-down butt jabbed into someone’s face, is a highly effective way of putting a stop to his yack.

1983, Nicolas Freeling, The Back of the North Wind

Would-be gags from would-be gagsters. And, nine chances out of ten, not a yak in the lot.

1951, Fredric Brown, Mack Reynolds, Cartoonist

Quick cash, flip that, now I got big cash. Sit back, sip yak with a next piff yat.

2018 November 30, “Bits” (track 10), in Original Sounds‎, performed by Bru-C and Window Kid