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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 08, 2014
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8
a word used not only to express happieness, but also in conjunction with hand symbols to express size.
-YAY! i won the lottery!

-hes about yay high *hold out hand*

-the box was yay wide by yay high
by berserker395 June 29, 2005
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9
1. When something is spectacularly fantastic!

2. Sarcasm when something overly unbelievable happens.
1. I'm going on vacation and I'm going to get tan! yay!!

2. I forgot my card in the ATM machine. yay!!
by yvonne March 12, 2003
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10
the illicit substance also known as cocaine
You can find me in St. Louie,
Where the gun play ring all day.
Some got jobs, and some sell yay.
Others just smoke and fuck all day.
by Nelly February 09, 2005
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11
Noun.

Expression of happiness.

Can be used as a verb.
Carlos - yay

Lucy - what are we yaying about
by MrDinkleberry August 23, 2006
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12
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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13
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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