Green’s Dictionary of Slang

hokey-pokey n.2

[rhy. sl. = chokey n. (1)]

solitary confinement.

[UK]Answers 30 Mar. 280/2: But I am reminded that I have not yet described that horrible institution known as the dark cell – chokey,* we convicts called it. (*‘Hokey-pokey’ is the rhyming slang for it).