Green’s Dictionary of Slang

bisexual.

c.1930		(ref. to 1898) N. Kimball Amer. Madam (1981) 261: Old Sugar Mary said I lost trade by not going in for the sissy byplay.
1964		Lavender Lex. n.p.: bi:–Bisexual, Ambisexual.
1971		Guardian Weekly 23 Jan. 21: He looked at Mick Jagger and shouted to a henchman: ‘Hey, Dave, this guy is bi.’.
1978		A. Maupin Tales of the City (1984) 100: A lot of guys who come here are gay . . . or at least bi.
1989		Kirk & Madsen After The Ball 281: Straight white male seeks similar for hot times. No gays, bis.
1978		S. King Stand (1990) 1038: She’s bi now.
1998		A. Warner Sopranos 193: Catriona isn’t lesbian! Just a bit bi.
2000		Guardian Rev. 31 Mar. 7: Take this month’s Elle cover story on ‘Bi-try babes’.
2003		50 Cent ‘In da Club’ 🎵 Now shawty said she feeling my style, she feeling my flow / Her girlfriend willin to get bi and they ready to go.
2004		L. Redhead Peepshow [ebook] I booked her and Jamie to do a bi-twin show.
2012		Topix Local News (Johannesburg) 1 Nov. 🌐 Gay / Bi males in south africa bbm trade.