be hot stuff

1. To be very sexually attractive or exciting. Man, that supermodel is really hot stuff! Of course you have a crush on that singer, he's hot stuff! That girl at the bar is hot stuff—why would she talk to dorks like us?

2. To be particularly popular, fashionable, interesting, exciting, etc. That new talking robotic doll is hot stuff for gift-seeking parents this holiday season. That new pilot thinks he's hot stuff, but he's got a lot to learn. The movie star has really been hot stuff in the media lately.

3. Especially of media (such as books, magazines, videos, etc.), to be erotic or salacious. Man, this magazine you swiped from your brother's room is hot stuff! I brought a movie with me, and, fellas, it's hot stuff. Are you ready for this? A: "Is that a naked woman?" B: "It sure seems to be hot stuff. Where did the boys get ahold of something like this?"