Green’s Dictionary of Slang

(N.Z. prison) an over-inquisitive individual, possibly an infomer.

2001

D. Looser Boobslang [U. Canterbury D.Phil. thesis] 142/2: pokey n. 1 an annoying inmate who repeatedly walks past inmates’ cell doors and ‘pokes his nose’ inside, causing the other inmates to regard him suspiciously as a potential tealeafer.