Green’s Dictionary of Slang

choco n.3

also choc, chocko, choko
[chocolate frog n. (2)]

(Aus.) a Mediterranean immigrant .

[Aus]B. Humphries Traveller’s Tool 79: Ethnic minorities whether they be oil slicks, chockos or slopies.
[Aus]K. Lette Girls’ Night Out (1995) 126: This one’s called Petro. He’s a big choc, you know really woggy.
[Aus](con. 1970s) G. Seal Lingo 104: Persons of Greek descent were called chokos, [...] gow meant wog.
[Aus]D. McDonald Luck in the Greater West (2008) 69: We’re lebs. Ah, except this bloke, he’s a choco [i.e. Italian].