A colloquial term for masturbation, or slapping the salami.
What do you think Dave is doing at home? Eh, heβs probably Yacking it.
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If you throw up Jack Daniels in a Spanish speaking country. In English you would Yack Jack, however Spanish people pronounce words starting with J as Y, hens Yack Yack.
(Dude throwing up Jack Daniels in Cancun when a local is around and sees)
Dudes Friend: Where did my buddy go?
Mexican Local: Oh, he Yack Yack Senior.
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to throw up, usually after drinking
I drank too much tonight, I just yacked behind his shed
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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.
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verb. Meaning to throw up or vomit.
I am going to yack on your sweater.
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