Green’s Dictionary of Slang

riwai n.

[‘M?ori riwai, ‘potato’; a figurative or transferred use of ‘potato’ as anything that is ‘brown on the outside’ but ‘white on the inside’ Looser (2001)]

(N.Z. prison) a M?ori prrison officer seen as favouring white inmates ands theiir culture.

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[NZ]D. Looser Boobslang [U. Canterbury D.Phil. thesis] 154/1: riwai n. 2 a M?ori prison officer considered by Maori inmates to have internalised Pakeha values.