Green’s Dictionary of Slang

(Aus./UK) the female breasts.

1966		Trimble 5000 Adult Sex Words and Phrases.
1978		Maledicta II:1+2 (Summer/Winter) 118: He [...] also lists: [...] Manchester Cities Titties.
1980		Barltrop & Wolveridge Muvver Tongue 11: One or two rhyming expressions existed – ‘threepennies’, for ‘threepenny bits’, and ‘Manchesters’ – but were never much used.
2002		Pete’s Aussie Sl. Home Page 🌐 Manchester Cities: titties.