Yay is defined as an expression of approval, great happiness or excitement.interjection
An example of yay is what you would shout upon winning the lottery.YourDictionary definition and usage example. Copyright © 2013 by LoveToKnow Corp.
- yea ()
- Informal this; so: often with a gesture indicating size: yay big, yay high
Used by arrangement with John Wiley & Sons, Inc.
Origin: Alteration of yea.