shunter’s pole, n. — Green’s Dictionary of Slang

shunter’s pole n.

[railway jargon shunter’s pole, a rod used to facilitate the coupling and uncoupling of goods wagons and engines / pole n.]

the penis.

1980

Maledicta IV:2 (Winter) 191: Who, after learning that the correct technicality for a shunter’s pole is a coupling bat, could resist applying either term to the pole used for a different kind of coupling?