Green’s Dictionary of Slang

honkoe n.

[? honkie n., but with no racial overtones or honk v.²]

(Aus.) a general term of abuse.

1965		W. Dick Bunch of Ratbags 42: I don’t care about them honkoes over at the Mont, they’re only wackers.
1984		Partridge DSUE (8th edn) 565/1: since ca. 1930.