The story
Piccadilly + circus.
Etymology from Wiktionary, CC BY-SA 4.0.
Today it means: A traffic intersection in the West End of London, having connections with Piccadilly, Regent Street, Shaftesbury Avenue, Haymarket, Coventry Street and Glasshouse Street; proverbially visualised as being very busy with people. Full definition →
Piccadilly + circus.
Etymology from Wiktionary, CC BY-SA 4.0.