There are 2 definitions of yay in English:

yay1

Syllabification: yay

exclamation

informal
Expressing triumph, approval, or encouragement: Yay! Great, Julie!
More example sentences
  • We went back to the JXC and worked on our ethics essay and I ended up finalising it and printed it out. Yay!
  • I'm going out tonight, I have a movie thing tomorrow, I have a party next week… yay!
  • More books that have been on my list for absolutely ages, yay!

Origin

1960s: perhaps an alteration of yeah.

Definition of yay in:

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Word of the day antebellum
Pronunciation: ˌantɪˈbɛləm
adjective
occurring or existing before a particular war…

There are 2 definitions of yay in English:

yay2

Syllabification: yay
(also yea)

adverb

North American informal
(With adjectives of measure) so; to this extent: I knew him when he was yay big
More example sentences
  • You're probably used to seeing the American armadillo, sometimes called the midget armadillo, which only grows to be about yay big.

Origin

1960s: probably a variant of the adverb yea1.

Definition of yay in: