If you're reading the Harry Potter books, or on a website in the fandom, then Ravenclaw is a house in Hogwarts.
The attributes of Ravenclaw are knowledge and wit. The house colours are blue and bronze. The founder is Rowena Ravenclaw, and the head of house is Flitwick.
However, if you're a Detentionee, it means the sexiest house. Much sexier than you.
You see those Ravenclaws over there? Yeah. They're sexier than us, aren't they?