Green’s Dictionary of Slang

dapto n.

[the Dapto Dog Races, held in NSW; thus a dog n.2 (1b)]

(Aus. teen) a general insult.

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[Aus] (ref. to late 1970s) G. Seal Lingo 104: The following general terms of insult were in common use among [...] Sydney schoolgirls in the late 1970s: trog, dapto, mang, poonce (continuing an earlier usage) and nerd, the last being still in use with this age group.