/ jeɪ; NAmE / exclamation , adverb
( informal , especially NAmE )
■ exclamation
used to show that you are very pleased about sth :
I won! Yay!
■ adverb
1.
to this degree
SYN so :
The fish I caught was yay big.
2.
to a high degree
SYN extremely :
Yay good movie!
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WORD ORIGIN
exclamation 1960s: perhaps an alteration of yeah .
adverb 1960s: probably a variant of yea .