dopey, n.¹ — Green’s Dictionary of Slang

dopey n.¹

also doper, dopye

[poss., as suggested by Partridge and Williams, a misprint for doxy n. (1) and used interchangeably by Dekker; however, note Henke, Gutter Life and Language (1988), who sees a link to SE didapper/dydapper, often abbr. as doppe/dopper, a small diving waterfowl which exhibits its hindquarters when it dives for food]

a female beggar, often a prostitute.

1608		Dekker Belman of London C2: Another swore daggers and kniues to cut the throate of his Dopye, if hee found her tripping. [Ibid.] D3: After the Vpright-men haue deflowred them (which commonly is when they are very yong) then are they free for any of the brotherhood, and are called Dells no more, but Dopers. [...] When they haue gotten the title of Dopies, then they are common for any.
1785, 1788, 1796		Grose Classical Dict. of the Vulgar Tongue.
1811		Lex. Balatronicum.
1823		Egan Grose’s Classical Dict. of the Vulgar Tongue.
1859		Matsell Vocabulum 27: dopey A thief’s mistress.

dopey n.1

dopey n.¹