Cocaine, Snow, Blow, Sugar Booger, Yayo, White Girl, Coke
You gotta watch them bitches that wanna snort up all your yay.
by Angelo August 24, 2003
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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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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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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 2, 2006
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"yais" is a different way of saying "yes." From what I can tell, it's origins are from the West Virginian area. All you'll ever need to know is that it means "yes" or "yeah."
"That's coo'!"
"Yais... It sure is."
by AdiaxX December 19, 2004
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Your an idiot.

Posted on the internet to when someone acts foolishly or says something completely dumb.

Pronounced 'Yay' and said with enthusiasm.
Person 1: Do you know the capital of Luxembourg, in Europe?

Person 2: Wait, I thought Europe was a country...

Person 1: YAI!

Person 2: Is that like Chinese or something?

Person 1: *Facepalm*
by RedAckbar December 20, 2010
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