Where "Lairy" Comes From
The word goes back to British Cockney slang from the early 1900s, from "leery" (meaning cunning or knowing).
It picked up a slightly different spin in Australia — less about being sly, more about being over the top.
“Those lairy boardies are going to be seen from the other side of the beach.”
“He gets a bit lairy after a few drinks, so we keep an eye on him.”
He turned up to the wedding in a lairy pink suit nobody could miss.
How Aussies Actually Use It
Usually aimed at clothing, behaviour, or style that's too loud or attention-seeking.
Lairy has a judgemental edge, but usually a humorous one. Calling a shirt, a car or a mate's attitude lairy means it is loud and flashy enough that you noticed it and are mildly unimpressed. It rarely comes across as a serious insult, more like a raised eyebrow. It also stretches from clothing to behaviour, so a lairy bloke at the pub is one who is getting a bit too loud and cocky.
Compared with "flash", which can be neutral or even admiring, lairy leans negative. Compared with "aggro", it is less about violence and more about showing off. That is a useful distinction for learners: a lairy outfit is garish, a lairy person is attention-seeking, and neither is necessarily dangerous. It is casual, spoken and mostly directed at people you know, so it is best kept for banter rather than describing a boss or a stranger to their face.
See also: Flash as a Rat with a Gold Tooth (similar meaning, longer idiom), Show pony (someone who loves to show off), Big Note Yourself (boasting behaviour).
Often paired with the classic put-down "pull your head in" when someone's being a bit too lairy.
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