What is the meaning of character avant-garde

I think some times say people character, avant-garde, said this person character is more cheerful and more lively what things can think of especially open and do what things will not be unique will be particularly open kind of meaning I think this word some times say is a positive word, sometimes used in a certain kind of language, can be said to be pejorative, for example, say a person character is particularly open, or, to the Sexual orientation, is also very open, and not too much attention to their own, well, all aspects, I think some times is also a kind of debauchery meaning, should also be in real life in some of the meaning of the meaning of the meaning of unrighteousness, in which you can also say that a person's character is more cheerful, the meaning of the word.