DELLS,
young bucksome Wenches, rip and prone to Venery, but who have not lost their Virginity, which the Upright Man pretends to, and seizes: Then she is free for any of the Fraternity. Also a common Strumpet.
Dells in the 1811 Vulgar Tongue
Also see examples in Canting Songs and Slang Rhymes collected by John S. Farmer (1896).