From Wiki:
The term carries a connotation of arcane enlightenment (the opposite of 'Philistines'), and also carries a less frequently intended, pejorative connotation of carelessness about personal hygiene and marital orthodoxy. Bohemians were often associated with drug use, alcoholism, and simple living.
? The term 'bohemian' has come to be very commonly accepted in our day as the description of a certain kind of literary gypsy, no matter in what language he speaks, or what city he inhabits .... A bohemian is simply an artist or littérateur who, consciously or unconsciously, secedes from conventionality in life and in art. ?
?Westminster Review, 1862[1]
The term has become associated with various artistic or academic communities and is used as a generalized adjective describing such people, environs, or situations: bohemian' (boho - informal) is defined in The American College Dictionary as "a person with artistic or intellectual tendencies, who lives and acts with no regard for conventional rules of behavior."
Many prominent European and American literary figures of the last 150 years belonged to the bohemian counterculture, and any comprehensive 'list of bohemians' would be tediously long. Bohemianism has been approved of by some bourgeois writers such as Honoré de Balzac, but most conservative cultural critics do not condone bohemian lifestyles. Ironically enough, bohemianism by definition can only exist within a framework of conservative values.
Noted New York Times columnist David Brooks (journalist) contends that much of the cultural ethos of upper-class Americans is Bohemian-derived, coining the paradoxical term "Bourgeois Bohemians" or "Bobos."[2]