Yay is defined as an expression of approval, great happiness or excitement.
Used to express joy or elation.
Well done; excellent
Yeah is defined as a way to express yes.
Find another word for hurrah. In this page you can discover 26 synonyms, antonyms, idiomatic expressions, and related words for hurrah, like: yay, hurray, whoopee; hear, three cheers, huzza, yippee, hear; hip-hip, bravo, zeal, joy and hoorah.