Green’s Dictionary of Slang

Gizza Club n.

[gizza, i.e. ‘give us a...’]

(N.Z. prison) a nickname for those parasitic inmates who are constantly scrounging from their peers.

[NZ]D. Looser Boobslang [U. Canterbury D.Phil. thesis] 144/2: president of the gizza club, the n. an inmate who bludges from other inmates.