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14.
To puck or vomit a bad dinner or drink.
I think I'm going to yack up those bad clams we just ate.
by k2aileron December 06, 2006
 
1.
to throw up, usually after drinking
I drank too much tonight, I just yacked behind his shed
by Vick March 06, 2005
 
2.
Abbreviation of Cognac - i.e. expensive Brandy. Alcoholic beverage
me and my brothers sipping yack
by Mutspelski February 15, 2005
 
3.
cocaine, blow, powder, snow, gack
let's get yacked out tonight man.
by BiGFiSH May 30, 2006
 
4.
verb. Meaning to throw up or vomit.
I am going to yack on your sweater.
by ToplessFlamingo January 21, 2007
 
5.
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 25, 2009
 
6.
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 04, 2007
 
7.
To be ridiculously wet shooting the basketball; used in same context as "swish" or "splash." Can also be used in other context, such as a long killstreak in Modern Warfare 2, and combined with other words to form fantastic contractions.
Here's Bryant, for three...YACK.

I was yackin' on some bitches in M-Dub Deuces last night.

Combinations: yackadaisical, yack in the box, Yackensack, yackity-yack don't talk back, yack my bitch up, etc.
by flea61 April 19, 2010