Green’s Dictionary of Slang

(UK Und.) Manchester, UK.

1865		Leaves from Diary of Celebrated Burglar 7/1: None pleased the company so much as inoffensive ‘Butty,’ the ‘chat-pitcher’ from ‘Man’.
1882		Manchester Courier 28 Jan. 10/5: If I were you I’d go to Man (Manchester), and write no more for anybody.