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1. A person who is very sexually attractive. (Sometimes used as a pronoun.) Man, that supermodel is really hot stuff! Hey, hot stuff. Fancy spending the night with someone like me?
2. Someone or something that is particularly popular, fashionable, interesting, exciting, etc. That new talking robotic doll is hot stuff for gift-seeking parents this holiday season. The movie star has really become hot stuff in the media lately. That new pilot thinks he's hot stuff, but he's got a lot to learn.
3. Something that is erotic or salacious, especially media such as books, magazines, videos, etc. Man, this magazine you swiped from your brother's room is some hot stuff!
hot ˈstuff(informal, especially British English)
1 somebody/something of very high quality: He’s really hot stuff as a tennis player.
2 a sexually attractive person; a film/movie, book, etc. that is exciting in a sexual way: She seems to think he’s really hot stuff. ♢ His new book is really hot stuff.
n. a person who acts superior (to others). (Also a term of address.) What makes you think you’re such hot stuff?