Yay Definition

interjection
Used as an exclamation of pleasure, approval, elation, or victory.
American Heritage
Webster's New World
Yay is defined as an expression of approval, great happiness or excitement.
An example of yay is what you would shout upon winning the lottery.
YourDictionary

(colloquial) Alternative form of yea (yes).

Wiktionary
adverb
So; by this amount.
“The fish was yay big” he said, spreading his arms three feet apart.
American Heritage
Webster's New World
This; so.
Yay big, yay high.
Webster's New World

(chiefly US) So, this (accompanied by a hand gesture)

The pony was yay high.
Wiktionary
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noun
Webster's New World
The name of the letter for the y sound in Pitman shorthand.
Wiktionary

(US, slang) Cocaine.

Wiktionary

A branch of the Thai language.

Wiktionary

Origin of Yay

  • Alteration of yea (“yes; even, truly, verily"). More at yea.

    From Wiktionary

  • From Spanish llello.

    From Wiktionary

  • Alteration of yea

    From American Heritage Dictionary of the English Language, 5th Edition

  • Probably from yea

    From American Heritage Dictionary of the English Language, 5th Edition

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