A unit of length commonly applied in the study of caldera volcanoes. Approximated by 1/2 an arm span of a tall university professor.
The pyroclastic fall deposit here is about yay thick *holds arms out to show size*.
by Aegerine October 8, 2014
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something that can be expressed best with full on vibes. this term is a bright and shining light, of super goodness, that beams out of your solar plexus and third eye, when filled with joy and happiness. it will then saturate anyone or anything that is open to such frequencies, and the YAY will be passed on and on and on. hugs, songs, winks, smiles, snickers, any happy receptive touch, are all great examples of YAY stimulators. YAY!! it just feels good...
YAY
by voodoomama February 4, 2010
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Noun.

Expression of happiness.

Can be used as a verb.
Carlos - yay

Lucy - what are we yaying about
by MrDinkleberry August 24, 2006
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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 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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