Green’s Dictionary of Slang

chokey n.

also chauki, chockey, chokee, chokie, choky, chookie
[Hind. chauki, a four-sided building or a shed, esp. a customs house or police station and thus a lock-up]

1. [mid-19C+] a prison; a lock-up also in fig. use.

2. [mid-19C+] (UK Und., also chokey-hole) the punishment cells.

3. [late 19C+] imprisonment.

4. [late 19C+] the prison punishment diet of bread and water; thus chokey merchant, one who is suffering such a punishment.

5. [1990s+] (UK black) physical violence, ‘punishment’.