Green’s Dictionary of Slang

1. US a coward [backform. white-livered adj. (1)].

1864

letter q. in Wiley Life of Johnny Reb (1943) 313: Jo Hooker [...] with his army of white livers.

2. a homosexual who has no interest whatsoever in women.

1941		G. Legman ‘Lang. of Homosexuality’ Appendix VII in Henry Sex Variants.
1965		Guild Dict. Homosexual Terms 49: white-liver (n.): A male (or female) homosexual who is absolutely indifferent to the opposite sex.

3. a lesbian with no interest whatsoever in men.

1965

K. Worthy Homosexual Generation Ch. xvi: A White Liver: A female having no feeling for the opposite sex whatsoever.

4. (US/W.I.) nyphomania.

1995		Francis-Jackson Official Dancehall Dict. 55: White-liver nymphomania: u. de gal ’ave white liver.
1999		‘Master Pimp’ Pimp’s Rap 57: Girlfriend just couldn’t get enough. I believe she had a white liver.