A really cool/funny/original person that isn't afraid to be themselves and tell people about it is often described to have class or be classy.
The term classy now a days ,how ever, is normally used in a sarcastic form, seeing as how the image of class over time has deteriorated completely but can still be seen as a compliment or a funny joke.
Guy: So what's up?
Girl: Just eating grilled cheese and watching mr.woodcock
Guy: You've got class
Guy 1: Yeah, she was wearing an extremely tight skirt and it's practically freezing outside. What a slut.
Guy 2: No way man! Tight skirt automatically means she's classy!