a mistress, prostitute or sweetheart, or possibly all three at once
► uses
Uses:
The angle of the street named as leading out of the Strand was dark of a night and a favorite place for doxies to go to relieve their bladders. The police took no notice of such trifles, provided it was not done in the greater thoroughfares (although I have seen at night women do it openly in the gutters in the Strand),
Anonymous. My Secret Life (1888)
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"[...] Little reason to hurry back, so far as I can see—I doubt your good man will ha’ taken a doxy to his bed in the time ye’ve been gone.”