Yay (def.) is an exclamation indicating joy, approval, congratulation, or triumph.
When I say “Yay” – you say “YAY” – Why? Because it feels so good. Why? Because it’s a perfect expression of joy; because even if you don’t feel like saying it, when you do say YAY – it makes you feel like saying it again – YAY!
Here’s an article on JOY & YAY… thanks to MetaVarsity for encouraging me to write it…
Wishing you all a year full of YAY!!!