noun [ U ] ( informal , especially BrE )
1.
a person who is sexually attractive :
She's pretty hot stuff.
2.
a film / movie, book, etc. which is exciting in a sexual way
3.
hot stuff (at sth) a person who is very skilful at sth :
She's really hot stuff at tennis.
4.
something that is likely to cause anger or disagreement :
These new proposals are proving to be hot stuff.