Green’s Dictionary of Slang

Smith n.

[‘it is usual for inmates who have either testified in court or molested children to change their names under police protection before coming to prison’ Looser (2001)]

(N.Z. prison) a paedophile or a known infomer: in both cases ‘Smith’ is adopted as a pseudonym by inmates who do not wish their real names to be known after testifying in court.

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[NZ]D. Looser Boobslang [U. Canterbury D.Phil. thesis] 170/2: Smith n. 1 a nark 2 a paedophile.