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, huzza, yippee, whoopee; hear, zeal, three cheers, joy, rah-rah, hear; hip-hip and cheer.