yack

in referance the Lil Jon & The East Side Boyz song "Da Blow" where the hook states "the blow, the pills, the yack, the herb". The term "yack" is actually referring to cognac (pronounced: "cone-yack"). So in essence the song is referring to the blow (cocaine), the pills (ecstacy and/or pharmacutical), the yack (cognac), the herb (marijuana). Which covers all the most common methods of getting fucked up.
In less urban environments, the term is more commonly used to describe the act of vomiting.
noun: yack means congac
verb: yack means to vomit

Da blow, da pills, da yack, da herb... (repeat)
or
I drank too much, I think I'm gonna yack.

by hunnygrl420 July 26, 2009

yack

verb. Meaning to throw up or vomit.

I am going to yack on your sweater.

by ToplessFlamingo January 25, 2007

yack

Abbreviation of Cognac - i.e. expensive Brandy. Alcoholic beverage

me and my brothers sipping yack

by Mutspelski February 15, 2005

yacking

to throw up due to intoxication.

last night krumples spent the night by the toliet. that's why we call her Mrs. Yack-Yack

by amanda September 7, 2003

Yack

to talk continuously, especially informally

All that Edward does is talk yack.

Edward: it's kinda like the idea of dog years
you know like a dog is 5, but it's actually like 30 in dog years
there should be some kind of conversion for girls to guys cause you know, girls kind of peak early
so like a 26 year old guy is like an 18 year of girl
Me: SHUT THE YACK UP!

Less yack, more work.

by #.1 August 16, 2010

Yacks

A word used exclusevly in the Edinburgh area (Scotland) meaning eyes.

"She hates it when I jizz in her yacks"

"it hit me right in the yack"

by Dr. Poppenstein September 15, 2007

Yacked

a synonym for fucked, stupid or any insult towards a persons mental ability

hes yacked, lets go

by Urban Bizz-Nizz January 10, 2018