Ruby (Murray), n. — Green’s Dictionary of Slang

Ruby (Murray) n.

also Arthur Murray

[rhy. sl.; the popular singer Ruby Murray (1935–96) or the ballroom dancing teacher Arthur Murray (1895–1991)]

a curry.

1983		R. Aven-Bray Ridgey-Didge Oz Jack Lang 17: Arthur Murray Curry, hurry.
1998		I. Welsh Filth 97: Try to dispatch the remains of last night’s Ruby Murray into the next life.
2001		M. Coles Bible in Cockney 9: Nowadays, if you’re popping out for a curry, it’s ‘I’m off for a Ruby.’.