A mistress or whore of a gentleman of the scamp. The blowen kidded the swell into a snoozing ken, and shook him of his dummee and thimble; the girl inveigled the gentleman into a brothel and robbed him of his pocket book and watch.
Definition taken from The 1811 Dictionary of the Vulgar Tongue, originally by Francis Grose.
Blow * BlowerNathan Bailey's 1736 Dictionary of canting and thieving slang
John S. Farmer's collection of canting songs and slang rhymes