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]
The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.
How to use something else in a sentence
And it is that Something-Else in us which makes the significant part of us, which sets our value and place in the scale of being.Preaching and Paganism | Albert Parker Fitch
“To the course which I have taken and am now defending,” replied Something-else within him hotly.Blue Lights | R.M. Ballantyne
The same glimmer showed me something else-Brown's face on the ground, white as a stone, his eyes wide open with an unseeing stare.The Lightning Conductor | C. N. Williamson