Green’s Dictionary of Slang

(US Und., N.Y.) the Jefferson Market Court, New York City, esp. in its role as the night court for the trial of prostitutes.

1958

Murtagh & Harris Cast the First Stone 186: A few old-timers in their sixities and seventies who had contact with the old Jefferson Market Court are still around today [...] they have a fond feeling for ‘old Jeff.’.