Wordnet 3.0
NOUN (2)
1. 
 the quality of being attractive and exciting (especially sexually exciting); 
- Example: "he thought she was really hot stuff"[syn: hot stuff, voluptuousness]
2.  the quality of being popular; 
- Example: "skiing is hot stuff in New Hampshire"
WordNet (r) 3.0 (2006):
hot stuff
    n 1: the quality of being attractive and exciting (especially
         sexually exciting); "he thought she was really hot stuff"
         [syn: hot stuff, voluptuousness]
    2: the quality of being popular; "skiing is hot stuff in New
       Hampshire"