Green’s Dictionary of Slang

(orig. Anglo-Ind.) to chat, to gossip.

1906		Civil & Milit. Gaz. (Lahore) 15 Sept. 5/1: Mrs. Gup, the Police Sahib’s wife, might be classed as a reporter of the proceedings [...] She beat all the ladies hollow in the matter of scandal.
1938		J. Curtis They Drive by Night 25: ‘Because you ain’t got a lodger,’ said Shorty, stirring his tea and wishing they wouldn’t gup so much.