‘Gropecunt Lane was a name used in English-speaking towns and cities in the Middle Ages for streets where prostitutes conducted their business. In most cases, the name would appear to derive directly from the words grope (sexual touching), and cunt (female genitalia). At one point there were streets of this name in many cities in Britain and Ireland, though in most cases later sensibilities changed the name to some more polite variation.
In London, the street that was Gropecunt Lane was near the present-day site of the Barbican Centre in the City of London. The street was called Grub Street in the 18th century, but renamed Milton Street in 1830. It is possible that the street known as Gropecunte Lane is now known as Threadneedle Street, however.’