Bohémian means the word of French origin and first used in the English language in the nineteenth century to describe the untraditional lifestyles of marginalized and impoverished artists, writers, musicians, and actors in major European cities. 

Bohémians were associated with unorthodox social viewpoints, and/or unconventional in appearance and/or behaviour, and/or eclectic values which were often expressed through, frugality, and/or voluntary poverty.

The term emerged in France in the early 19th century when artists and creators began to concentrate in the lower-rent, lower class gypsy neighbourhoods.  The term Bohémien was a common term for the Romani people of France, who had reached Western Europe via Bohemia.

As noted in Pioneer Fit Old Farts our former Prime Minister, Kevin Rudd, was keen to use colloquial language to best relate to an audience which talks everyday spoken language eg "Fair shake of the sauce bottle".

^{(Most of above taken from Wikipedia_}