Green’s Dictionary of Slang

envelope n.

(N.Z. prison) a weakling [? ‘they fold up’].

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[NZ]D. Looser Boobslang [U. Canterbury D.Phil. thesis] 66/1: envelope n. a weak person who gives way easily.

In compounds

envelope licker (n.)

(N.Z. prison) a lesbian [her presumed predeliction for cunnilingus].

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[NZ]D. Looser Boobslang [U. Canterbury D.Phil. thesis] 66/1: envelope licker n. a lesbian.