be something else

1. To be hilarious and extremely entertaining. A: "So then I said, 'That's not a lady—that's my wife!'" B: "Hahaha, oh Jack, you are something else." Jack's story was something else, wasn't it? I thought I was going to cry, I was laughing so hard!

2. To be very remarkable or intriguing. That performance was something else, Sarah. I've never seen anything like it! You're something else, Mark. I'm just constantly in awe of what you are able to achieve in this company. Three touchdown passes in the first quarter alone—their new quarterback is really something else!

3. To be abhorrent or repugnant. I mean, we've all done things we're not proud of. But stealing money from your dying mother? That's something else, Marty. Taking a day or two off to deal with the situation is one thing, but being gone from work for nearly a month is really something else. I'm beyond disappointed—I'm completely dumbfounded! I know that all teenagers get into trouble every now and then, but stealing test answers and selling them? That's something else entirely!

something else, he/she/it is

Someone or something is extraordinary, in a positive sense. It does not mean “something different” but is a slangy elaboration of the simpler “isn’t that something.” It is usually said admiringly, as in “Kayla Cole is something else” (James Patterson, London Bridges, 2004).