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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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How bout dem knicks? 

A phrase referring twoard the New York Knicks.
Its usually said to break an unplesent moment of silence.
Guy 1: I think I may be gay.
Guy 2: ...
Guy 1: ...
Guy 2: How bout dem knicks?
How bout dem knicks? by Flame060 March 28, 2005
Word of the Day on June 8, 2026
Related Words

Power Couple 

A relationship between two people who are equally as cool as each other. They are as individually awesome and fun to be around as they are when they are together.

Neither one depends on the other for their feelings of self worth- they know in their heart that they are just as valuable to the world as the other. Good looking, optimistic, and sparks a light in the world that people recognize that goes beyond a normal relationship.

In a power couple, if one person is flawed, the other person makes up for their weaknesses in strength. Together they are the epitome of what anyone would desire in a relationship. They encourage goodness in the world and make it a better place by being together.
I'm a fan of those two, they are such a power couple, the epitome of what anyone would want in a relationship.

I am envious of them because they are a power couple.
Power Couple by Pina28 May 23, 2012
Word of the Day on June 7, 2026
Spidey sense for evading poop on the street, canine or otherwise.
When walking in NYC or LA, you need shitdar.
Shitdar by Sickomonster June 3, 2026
Word of the Day on June 6, 2026

Shackteâu

A Shackteau is a humble, weather-beaten, structurally questionable shelter located in a spectacular or highly coveted place—Wales, Jackson Hole, Sun Valley, Crested Butte, coastal Maine, the Alps—where the building itself may be worth almost nothing, but the dirt, view, access, and mythology make it absurdly valuable.
In use:
Shackteâu - We thought it was an abandoned shed until the realtor called it a rare alpine Shackteâu with unobstructed views and listed it for $2 million.
Shackteâu by ez-dog June 4, 2026
Word of the Day on June 5, 2026
Sonion comes from a GIF that is a mix of the word son and onion ( if you use this slang you like dih)
Man 1 says "I drank last night I need a break" Man 2 "Sonion"
Sonion by popularloner67 March 11, 2026
Word of the Day on June 4, 2026

breatharian 

One whos diet consists of air, light, and prana, with a possible sip of water now and then.
The breatharian has air, light, and prana for food.
breatharian by leena gabor November 8, 2005
Word of the Day on June 3, 2026