Green’s Dictionary of Slang

1. a shoe; often in pl.

1932		‘P.P.’ Rhy. Sl.
1960		J. Franklyn Dict. of Rhy. Sl.

2. the number two.

1952

Argus (Melbourne) 13 June 4s/4: The old numerical jargon of the housie games — ‘currant bun’ for one, ‘how-do-you-do’ for two, ‘Doctor Bevan’ for seven.