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Cocaine, Snow, Blow, Sugar Booger, Yayo, White Girl, Coke
You gotta watch them bitches that wanna snort up all your yay.
by Angelo August 23, 2003
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15
Simply, cocaine, from the shortening of the misspelling of the pronunciation of llello, the Spanish word for cocaine.
From "Hopeless" by Ludacris:

Then my eyes turn red,
The sky turns grey,
Children slingin' white in the hood,
We call it "YAY!"
by Lil Dre March 19, 2006
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16
In the United Kingdom 'Yay' is most often used by young girls, to express hapiness at something, in a childlike way.

This seems to arise from the use of 'yay' by toddlers who cant say hooray properly.

Yay is often used to express delight at something in a childlike way.

It is rare to hear an adult in the U.K. saying this, unless they are talking to a baby or toddler.
It's christmas, Yay!
Yay, I won a prize!
Yay, Tellietubbies are on the T.V.
by Kai_76 February 18, 2008
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17
Slang term for cocaine, derived from the similar yayo.
"I was getting tired, so I excused myself from the table and went to the bathroom to blow some yays in a stall."
by T. H. Pine January 01, 2006
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20
1. Slang for Cocaine.
2. Slang for cocaine that is relatively cheaper than the real stuff because it has been cut into a much less pure form.
3. An expression of enthusiasm or joy, often meant to be facetious.
Yay, a bag of Daz!
by Illusion420 August 31, 2010
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