The exact source of this version is unclear, so it is best understood through how people use it online. “Banzai” is widely recognized as a Japanese cheer or battle cry, which gives the clip an instantly readable sense of commitment, attack or wild enthusiasm. On soundboards and short-form video edits, it survives because the single shouted word is easy to time with a run, jump or sudden decision. Its meaning is simple, and that makes it flexible across memes, skits and action parody clips.