The meaning of the word Banzai
A word with meaning equivalent to "Long live to the king" and things like that! Nowadays it is still confused as a battle cry, mainly because kamikaze shouted Banzai before they explode in the second world war.
What does banzai mean in slang?
: a Japanese cheer or war cry.
Why do Japanese people say banzai?
(used as a Japanese patriotic cry or joyous shout.) (used as a Japanese battle cry.) leading to likely or inevitable death; suicidal: a banzai attack by Japanese troops in the last days of World War II.