Green’s Dictionary of Slang

1. a cultural non-conformist, a bohemian; often attrib.; thus bohoism.

1968		T. Wolfe Electric Kool-Aid Acid Test (1969) 22: What a curious bunch of bohos.
1971		Current Sl. VI.
1991		N. George ‘Ghettocentricity’ in Buppies, B-Boys, Baps and Bohos (1994) 96: Hip hop bohoism as only self-consciously idiosyncratic middle-class kids have time to manufacture.
1999		N. Cohn Yes We have No 295: It became an all-purpose boho paradise.
2000		Indep. Rev. 28 Jan. 14: He unwittingly embellishes the enigmatic boho myth by saying the guy was a loner.
2010		Codella and Bennett Alphaville (2011) 75: East Village club kids and punk rock bohos.

2. (orig. US campus) in ironic, teasing use, one who identifies with the 1960s; often attrib.

1987		Eble Campus Sl. Spring.
1999		Indep. Rev. 15 Sept. 8: This season’s boho chic look.
2000		Guardian G2 8 Mar. 15: An exemplary role model for boho rockers.