Green’s Dictionary of Slang

bull bitch n.2

[bull adj.1 (3) + bitch n.1 (3i)]

1. (US) a masculine lesbian.

[US]Wentworth & Flexner DAS.
D. Maurer in Mencken Amer. Lang. (1963) 728: The bull bitch or butch pimp [is] a lesbian who has one or more girls and services them like a man.
[US]J. Rosenfeld Sex, Sin & Society 127: [A] tough-looking, cigar-smoking, broad-shouldered bull bitch—searching in the wrong bar—looking for her sapphist girl friend [Simes:DLSS].
[US]B. Rodgers Queens’ Vernacular 38: bull-dagger [...] Syn: bull bitch [dyke].
[US]H. Rawson Dict. of Invective (1991) 45: Common current forms include [...] bull bitch (a woman with masculine traits).
Randolph & Legman ‘Unprintable’ Ozark Folksongs I 565: ‘Mary Lou’, the rough-tough, capable, manstyle, bullbitch or ‘bitchen’ female heroine.
[US]F.X. Toole Rope Burns 83: ‘What if the ref sees me?’ ‘Keep the bull bitch between you and him and he won’t.’.

2. (US) a hermaphrodite.

[US]in Murray & Murrell Lang. Sadomasochism (1989) 46: Genuine bull bitches are rare, but they’re in super hot demand by the blue video industry.