Banzai
Hooray, Raising One's Arms, I Give Up
noun, verbal noun, interjection
Ten thousand years! That's a lot of time. This is the word for the turned-English Japanese phrase, banzai!
万歳 is a cheerful word used to shout "hooray!" when celebrating something good. Because it's usually said with both arms raised, the action of raising one's arms can also be referred to as 万歳. This is often used when talking to children, like when telling them to raise their arms to take off a shirt.
And since raising your hands can also mean "I give up" in Japan, 万歳 can sometimes mean that as well. So basically, it's either "Yay, we did it!" or "That's it, I'm done." It really covers all your bases!
The reading isn't the same as 万's normal reading. It's ばん instead of まん. And 歳 gets rendaku'd. But, since the word "banzai" is so well known, you probably can remember this reading: ばんざい (Hooray)!
And if it's too hard and you can't remember, you can still say ばんざい (I give up). Basically, you're gonna end up saying ばんざい either way, so you'll remember it eventually… in theory, at least.
トフグのコウイチに万歳三唱をしましょう！万歳！万歳！万歳！
Three cheers for Koichi of Tofugu! Hip hip hooray! Hip hip hooray! Hip hip hooray!