Difference between Yes and Yay

YES vs YAY: NOUN

It is so; as you say or ask. Used to express affirmation, agreement, positive confirmation, or consent.
Ay; yea; -- a word which expresses affirmation or consent; -- opposed to no.

A word used to show agreement or acceptance.
A word used to indicate disagreement or dissent in reply to a negative statement.

A word which expresses affirmation or consent: opposed to no. It is also used, like yea, to enforce by repetition or addition something which precedes.
[For distinction between yes and yea, no and nay, see yea.]

Indeed, Yup, Sir, Maybe, Hmm, Yeses, Aye, Yep, Yay, Okay, Kidding, Huh, Hey, Yea, Yeah

Whoopee, Hoorah, Yahoo, Huzzah, Vive, Wow, Ay, Bravo, Whoa, Yeah, Yup, Yes, Hooray, Yippee, Yep

Actually, Indeed, Yup, Sir, Maybe, Hmm, Aye, Yep, Yay, Okay, Kidding, Huh, Hey, Yea, Yeah

Cool, Hurray, Awesome, Yee, Whoopee, Huzzah, Vive, Wow, Whoa, Yeah, Yup, Yes, Hooray, Yippee, Yep

Yes No If yes, do you already have any of the following documents?
Yes ____ No ____If yes, which Article number was subject to interpretation?
Yes, yes, we need you here to care for the children.
Yes No Yes population can be excluded as possible sweatshirt hairs?
Yes No If yes, how will the equipment be handled?
Dr Thum Ping Tjin: Yes, you have read that, yes.
Yes: No: If yes: How much per recipient?
The answer to that is yes, yes you can.
Yes Yes Yes No Determine Corrective Action Attempted Some other or Unknown event made it critial?
Seconded by Roll Call: Marv yes, Jolene yes, Terrie yes, Martin yes and Craig abstain.

So i have been printing quite nicely YAY.
Yay for bringing awareness to female sexual pleasure!
Yay for keeping those hot weather days cool!
Oh, yay, July is gonna be super exciting.
. yay. when do you start uni again?.
Not yay that you had to rebuild because of Harvey, but yay that this was helpful to you!
Yay for THAT woman and yay for HR!
"Yay epidemiologists yay." she said at one point, meeting an audience member who specialized in the field.
And therefore their whole yay yay America Trump thing is gonna go by the wayside.
All my other friends in HS were like yay chem and yay bio and yay psych and I was like yay Battle of Hastings!