Grave in French,
Grave mainly means serious in French, but it is also used by young people.
1. Pejorative meaning
Ce type est vraiment grave: this guy is the pits.
T’es grave toi ! you are a case! you are nuts!
2. Positive meaning
Il est trop grave ce film: this movie is too good!
Ce film est grave bien: this movie is really good!
T’as aimé le film ? – Grave ! Did you like the movie? – Too good!
Mes parents ? je les kiffe grave ! I love my parents so much.
J’ai grave faim: I am really hungry.
J’ai grave envie d’une pizza: I want a pizza so much!