What does something else mean?
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]
What does it mean when he says your something else?
It just means he is surprised by how great you are. It’s usually used as an extreme version of “you’re too ” “Something else” is just another way of saying “great” or better than average. An exceptional person or thing.
“the reaction from the crowd was something else”