Green’s Dictionary of Slang

din-din n.

also din-dins
[the pl. use is 1960s+]

(mainly UK juv.) dinner.

[UK]E.M. Forster Where Angels fear to Tread 47: ‘Din-din’s nearly ready,’ said Lilia.
[WI]Wodehouse Summer Lightning 265: ‘Come along, Carmody. Din-dins.’ Hugo had sunk into a chair. ‘I don’t want any dinner,’ he said, dully.
[UK]F. Norman Bang to Rights 113: If you get captured with one you’ll get a few days no din-din.
[UK]M. Frayn Towards the End of Morning (2000) 34: I’d have cooked din-dins for both of us.
[US]B. Rodgers Queens’ Vernacular 62: dindin baby talk for dinner.
[US]A. Maupin Further Tales of the City (1984) 212: What’s for din-din?
[Aus]R.G. Barrett Godson 299: ‘Be a good boy and eat your din-dins’.
[Ire]P. McCabe Breakfast on Pluto 134: Brings you off to the restaurant for a great big yummy din-dins!
[UK]J.J. Connolly Layer Cake 177: Danny’s got better things to worry about than where you two eat your din-dins.
[Aus]M.B. ‘Chopper’ Read Chopper 4 166: Some nagging female giving me hell for not coming home on time for my din dins.
[UK]J. Meades Empty Wigs (t/s) 397: ‘We were having dindins at Kendrick Mews. Somewhat liquid dindins, has to be said’.