Woo Yay! 

More often lowercase, woo yay is used as an apathetic response to someone's irrational exuberance.

Also known as "Here's a quarter, call someone who cares."

Little Bro: OMG LOOK I GOT LEVEL 9 IN FF7!
Big Bro: woo yay.

Woo Yay! by pinano July 14, 2004

Woo Yay! 

A shout of joy. Pretty much the same as w00t!. Usually used online.

I finally beat that video game! Woo Yay!

Woo Yay! by N8NESS December 14, 2003

woo yay 

A word of happyness. used often online (and alot on b3ta.com)

person 1:I just completed Burnout3
person 2:Woo yay

woo yay by Cloud November 3, 2004

woo-yay 

Expression of joy, elation, particularly related to istock earnings from downloaded photos

WOOOOOOOO-YAAAAAAAAY
i hit $300!

woo-yay by Fastfingers April 23, 2003

woo-yay 

a deep and meaningfull expression of delight and pure happiness, can also be used for an agreement to a proposal

i won! wooyay!
or wooyay! that sounds great

woo-yay by lady whiplash August 1, 2003

woo slash yay

A term of joy and delight usually used in conjunction with a swift diagonal hand chop when say the word "slash"

"Hey! Guess what guys? I just won a lifetime supply of red Smarties! Woo Slash Yay!!!"

woo slash yay by Bin Bag Ninja October 7, 2007