Green’s Dictionary of Slang

goose (and duck) n.

[rhy. sl. = fuck n. (1a)]

sexual intercourse.

[Aus]Dead Bird (Sydney) 28 Dec. 7/1: Says Mrs A., ‘What are you going to have for your Christmas dinner?’ says Mrs B., ‘Well, if Joe is at home I will have a good goose, but if he is not at home I do not know what I will have’.
[UK]Farmer & Henley Sl. and Its Analogues.
[US]Maurer & Baker ‘“Aus.” Rhyming Argot’ in AS XIX:3.
[UK]J. Franklyn Dict. of Rhy. Sl.
[UK]S.T. Kendall Up the Frog.
[UK]R. Puxley Cockney Rabbit.
[UK]K. Sampson Outlaws (ms.) 74: The tarts in there, all partied-up, ready for their once-a-year goose on the sly.
[UK]B. Dark Dirty Cockney Rhy. Sl.