Green’s Dictionary of Slang

lame duck n.2

[rhy. sl. = fuck n.]

an act of sexual intercourse.

[US]Maurer & Baker ‘“Aus.” Rhyming Argot’ in AS XIX:3.
[UK]J. Franklyn Dict. of Rhy. Sl.
[UK]R. Puxley Fresh Rabbit.
[UK]B. Dark Dirty Cockney Rhy. Sl.