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Used as an exclamation of pleasure, approval, elation, or victory.
[Alteration of yea.]
yay 2or yea (yā)
So; by this amount: "The fish was yay big" he said, spreading his arms three feet apart.
[Probably from yea.]
informal an exclamation indicating approval, congratulation, or triumph
[C20: perhaps from yeah]
yay(yeɪ) Informal. interj.
2. so; to this extent: I knew you when you were yay high.
[1960–65; probably alter. of yea]