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When ketamine and cocaine are mixed together to create a dangerous drug combination (most commonly mixed at a ratio of 1:1).

'Yay' comes from a Spanish word for cocaine: 'yeyo' (also referred to on this site and the film Scarface). 'K' is slang for ketamine and the phrase rhymes with the dangerous weapon 'AK47' - referring to the drugs dangerous and uncertain nature.

The term was first used and created on 05/07/09 in Hyde Park, London, England by a guy 'Mustang D' who incidentally & unfortunately ended up in a festival medical tent due to the effects of a mixture of Yay-K47 and various other narcotics (illustrating the potentially dangerous nature of the drug).

In a very short space of time the term has since become an extremely popular substitute for the previous slang word of the same meaning: 'CK1' (cocaine-ketamine) - due to it's ingenuity. It is currently in use around the South of England but is rapidly spreading around the world due to the extensive use of the Internet and social networking websites.

Official spelling is 'Yay-K47' but 'YayK47', 'Yey-K-47' have also been used.

Buying Yay-K47 from a stranger can be dangerous as it is impossible to truely know the ratio of the mix and whether or not other narcotics are present. Mixing narcotics or any drugs can be extremely dangerous.
"mad weekend! got blown away by some banging Yay-K47 and turfed out by security"

"wanna get off ya face? get sum Yay-K47, it'll blow ya away!"
Yay-K47 by Mustang D July 6, 2009
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It is said of the situation where a person has the bad luck to make contact with his testicles against an undefined surface or object, intentioned or not.
Given the nature of the word, it is more appropriate to design cases where the interaction is made with a moving object, for example, a ball.
Although it is extremely painful for the victim, it tends to be considerably funny to people who witness it.
Today in the baseball game the pitcher took a nutshot; the baseball hit him in the nuts.

Man, I just watched the funniest nutshot video ever.
Nutshot by Uberflaven March 1, 2009
Word of the Day on June 26, 2026
Related Words

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What a fucking nerd neck!

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"another of sayin peace out or good bye"
Talk to ya later......Love, Peace, and Chicken Grease
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slip of the tongue perhaps,
Those idiots who drive around in a ridiculously raised pick up truck, making a top heavy vehicle even more top heavy and unstable
A:*gah*
B: "Whats the matter"
A: This dam prickup is blinding me.
B: Stupid thing's, as if there lights weren't blinding enough as it is.
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Serial monogamists can not stand to be alone and often suffer from vast commitment and insecurity issues.

Because they jump into relationships immediately after the previous one has ended, serial monogamists typically don't take the time to reflect on their behavior or why their previous relationships failed; thus, they end up making the same relationship mistakes over and over again.
Person 1: Damn, Dustin already has a new girlfriend?! It's only been two weeks since he broke up with his fiance! I think he's a sociopath.

Person 2: No, he's a serial monogamist...
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liquid lunch 

A lunchbreak comprised entirely of alcoholic beverages, and no food.
"With all the lay-offs that morning, it was rough. I hit the bar around the corner for a liquid lunch mid-day."
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