Green’s Dictionary of Slang

a.i.f. adj.

[rhy. sl.; A.I.F., the Australian Imperial Forces]

deaf.

[Aus]R. Aven-Bray Ridgey-Didge Oz Jack Lang 17: A.I.F. Deaf.
[Aus]Pete’s Aussie Sl. Home Page [Internet] A.I.F.: deaf.