Green’s Dictionary of Slang

Visa n.

[play on SE plastic, i.e. the card, and plastic adj. (1)]

(N.Z. prison) of an inmate or officer, a deceptive, untrustworthy person.

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[NZ]D. Looser Boobslang [U. Canterbury D.Phil. thesis] 198/2: Visa n. an inmate or prison officer who is false and deceptive.