Green’s Dictionary of Slang

ainga n.

also a’iga, aiga
[Samoan ainga, a’iga or aiga, ‘extended family’]

(N.Z. prison) a group of inmates who are very close friends.

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[NZ]D. Looser Boobslang [U. Canterbury D.Phil. thesis] 5/2: ainga (also a’iga or aiga) n. a group of inmates who are very close friends.