SHE-Napper,
a Woman Thief-catcher; also a Hen-bawd, or Procuress; a Debaucher of young Virgins; a Maiden head-jobber.
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Entry taken from 1736 Canting Dictionary, by Nathan Bailey.
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She Napper in the 1811 Vulgar Tongue
Also see examples in Canting Songs and Slang Rhymes collected by John S. Farmer (1896).