Where "Dag" Comes From
As unglamorous an origin as Australian slang has to offer: a "dag" is literally the clumps of dried dung and matted wool that hang off a sheep's rear end — shortened from the British dialect word "daglock," which was borrowed into Australian English in the 1870s. From there, the word made a genuinely odd leap in the 20th century, first describing an amusing, eccentric character and eventually softening into today's meaning: someone endearingly uncool or socially awkward.
New Zealand comedian John Clarke, performing as his alter ego Fred Dagg, gave the word a big boost through popular TV appearances in the mid-to-late 1970s, helping cement "dag" and its adjective form "daggy" across both Australian and New Zealand English. Unlike harsher put-downs, calling someone a dag has stayed genuinely affectionate — it describes someone charmingly out of step, not someone to be mocked. An early print use of the "eccentric character" sense turns up in the Truth (Melbourne) on 10 June 1916, in a piece called "Flirting Flappers": "He claims to be regarded as a ‘dag’ / (The latest slang for manners debonnair)."
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"You're such a dag, but we love ya."
How Aussies Actually Use It
Almost always said with warmth rather than genuine insult — "you're such a dag, but we love ya" captures the gentle teasing at its core.
"Daggy" is the more common adjective form, describing anything from an outfit to a joke that's charmingly uncool.
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