Webster's Dictionary 
(1): (n.) The language of the Czechs (the ancient inhabitants of Bohemia), the richest and most developed of the dialects of the Slavic family.
(2): (n.) A restless vagabond; - originally, an idle stroller or gypsy (as in France) thought to have come from Bohemia; in later times often applied to an adventurer in art or literature, of irregular, unconventional habits, questionable tastes, or free morals.
(3): (n.) Of or pertaining to a social gypsy or "Bohemian" (see Bohemian, n., 3); vagabond; unconventional; free and easy.
(4): (n.) A native of Bohemia.
(5): (a.) Of or pertaining to Bohemia, or to the language of its ancient inhabitants or their descendants. See Bohemian, n., 2.
The Nuttall Encyclopedia 
Name given to one who lives by his wits and shuns conventionality.