also pokey, 1828, of places, "confined, cramped, shabby," later (1856), of persons, "slow, dull;" from varied senses of poke (v.) + -y (2). Also see poke (n.3), which perhaps influenced it. Related: Pokily; pokiness.
a correctional institution used to detain persons who are in the lawful custody of the government (either accused persons awaiting trial or convicted persons serving a sentence);