Green’s Dictionary of Slang

(Aus.) to brag, to boast, to show off; thus lairizer n., a cheeky show-off.

1938		Dly Examiner (Grafton, NSW) 5 Feb. 7/5: To the constable at Coolangatta who told the Police Magistrate that a defendant was ‘lair-ising’ on his motor cycle in the main street goes the credit of introducing a new word into [...] Australian slang.
1940		in G. Simes DAUS (1993).
1953		K. Tennant Joyful Condemned 22: She was ear-bashing me all over tea how you came lairizing round at our place like you owned it.
1959		D. Hewett Bobbin Up (1961) 9: A group of bodgies [...] whistled her shrilly down the wind. ‘Lairizers!’ Jack muttered.
1965		W. Grout My Country’s Keeper 139: People thought I did it ‘lairising’ – being a show-off – as we say at home. It seemed to them I had caught the ball and spilled it only when throwing it in the air, a favourite flourish of ’keepers but branded a ‘lair act’ by many Aussie spectators.
1968		D. Ireland Chantic Bird 178: A kid on a bike, lairising, leaned right over in front of me.
1974		Bulletin (Sydney) 5 Jan. 33/3: ‘Lairising around’ in London he acquired his wife, Sadie.
1981		Bulletin 19 May 65: The crew raced for stretchers, first aid kits, splints. The mountain men looked on impassively. ‘He was lairising,’ they said.
1992		R.G. Barrett White Shoes 260: All the lairising and running around. It was just a big smother.
1996		J. Byrell Lairs, Urgers & Coat-Tuggers xvii: Gloaming suddenly swivelled around and started carrying on like a rodeo bronc. That little bit of lairising cost him at least five lengths .