Green’s Dictionary of Slang

conversation, chatter.

1958		H. Macmillan speech 30 Jan.: Jaw-jaw is better than war-war.
1962		Taunton Courier 14 July 1/1: Rev. George Rayner says in his parish magazine that he is fed up with ‘jaw-jaw’.
1970		New Scientist 31 Dec. 588: The main result of all this jaw-jaw was merely the finalising of a draft treaty on the prohibition of the emplacement of nuclear weapons.
1989		H. Harrison Bill [...] on the Planet of Robot Slaves (1991) 213: All this jaw-jaw is accomplishing exactly nothing.
1999		Guardian Guide 19–25 June 30: I have a feeling this is idle, perhaps even careless jaw-jaw.
2000		Indep. Rev. 19 May 13: The New Romantic wars have been more jaw-jaw in a court of law.