Yay Definition

interjection
Used as an exclamation of pleasure, approval, elation, or victory.
American Heritage
Webster's New World
(colloquial) An expression of happiness.
Yay! I have finally finished my work!
Wiktionary

(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
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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