hot stuff

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun One that is exceptionally good, interesting, or exciting.
• noun A person who is considered sexually attractive.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun idiomatic, colloquial An attractive person, often used as a come on or pickup line
• noun idiomatic, colloquial Something excellent or exciting
• noun idiomatic, slang A roofing worker's term for hot bitumen.
• noun Used other than as an idiom: see hot,‎ stuff. (colloquial)

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun the quality of being popular
• noun the quality of being attractive and exciting (especially sexually exciting)