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A person, thing, or event that is quite remarkable, as in That pitcher is something else, or Her new film is something else. The else in this idiom means "other than ordinary." [Colloquial; early 1990s]
If you describe someone or something as something else, you mean that they are very unusual and usually very impressive. I thought I'd seen some interesting parts of the world, but Dubai really is something else. There are a number of young footballers coming through in this country. But Keane really is something else.
One that is very special or quite remarkable: Her new film is something else.