★“混”was once a derogatory term which means people idling around streets and not engaged in the right business. Possibly these years people all think they are engaged in work they dislike and lead their lives in these situations, so “混”stands for living now. “混”very well means living very well. It shows your senior care when asking the familiar whether they “混得”well or not while saying this term to a stranger would be taken as your sneering at him/her.