Green’s Dictionary of Slang

(US black) of a woman, unattractive.

[c.1786		Grose Classical Dict. of the Vulgar Tongue ms. additions n.p.: Scurvy Wench, a woman who wonts hair on a certain part. Who has f—d herself with a piece of salt beef & given her C—t the Scurvy. Point of Portsmouth Wit].
1980		E. Folb Runnin’ Down Some Lines 145: Unattractiveness is often characterized in terms that suggest [...] disease (scurvy).