aniseed Robin, n. — Green’s Dictionary of Slang

aniseed Robin n.

also anniseed Robin

[one Robin, a real-life aniseed-water seller d.1651 (and briefly married to the highwayman John Cottingham, exec. 1685), noted by Pepys as a hermaphrodite and well-known as such in mid-17C literature; a then popular song was entitled ‘Aniseed Robin’ or ‘Cuckolds All in a Row’]

a hermaphrodite; latterly generic for a prostitute.

1675		Wycherley Country-Wife I i: You will be as odious to the handsome young women [...] And to the city dames as aniseed Robin.
1683		R. Dixon Canidia v 8: To Dirty Whores give your respect. / Annyseed Robin, or Pudding-Pye-Doll.
1734		C. Johnson Hist. of Highwaymen &c 308: He found himself espoused to a Hermaphrodite [...] a person well known by the Name of Anniseed Robin.