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.

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Word of the day astrogation
Pronunciation: ˌastrəˈgāSHən
noun
(in science fiction) navigation in outer space

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.

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