One whose garments are bespattered with dag or dew: generally applied to the female sex, to signify a slattern.
Definition taken from The 1811 Dictionary of the Vulgar Tongue, originally by Francis Grose.
Drag Lay * Dragooning ItNathan Bailey's 1736 Dictionary of canting and thieving slang
John S. Farmer's collection of canting songs and slang rhymes