- Yay is defined as an expression of approval, great happiness or excitement.
An example of yay is what you would shout upon winning the lottery.
A young boy yells, "yay!"
yay definition by Webster's New World
Webster's New World College Dictionary Copyright © 2010 by Wiley Publishing, Inc., Cleveland, Ohio. Used by arrangement with John Wiley & Sons, Inc.
- yea ()
- Informal this; so: often with a gesture indicating size: yay big, yay high
yay definition by American Heritage Dictionary
Used as an exclamation of pleasure, approval, elation, or victory.
Origin: Alteration of yea.