In Britain (there's already loads for definations for the way Australians use this word), this word generally means a young male. However in modern Britain this word has come to mean someone who engages in typical testosterone-driven behaviour such as drinking, sport and having a laugh with mates, sometimes harmless, sometimes obnoxious or even worse antisocial. There was once the phrase "Jack-the-Lad" (a rogue), "laddie" has long been part of the Scottish dialect, and in the 90s something called "Lad-culture" arose, where the aforementioned behaviour was celebrated. Girls who behaved in a similar way were called "Laddettes". There is also the adjective "laddish".
This young lad was killed in a bike accident recently

He's one of the lads, they love their football

On Friday nights the town centre's full of young lads getting drunk
by ManofG March 5, 2009
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A British & Irish word used to describe a male aged between 9-30 years old or depending what way you use the word it can also be from 0-9 years old
"Where having a lads night this friday you up for it?"

"Those young lads are up to mischiff"

"My wife just gave birth to a wee lad"
by Harry69 July 6, 2007
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A name for someone who commits a pro-gamer move. Something like saying something sarcastic or ironic is fairly laddish.
"Davey is an absolute lad."
by ThePotatoWhoCould August 29, 2021
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A few things that describes 'Ladism' in Australia:

Nautica, Polo, Canterbury, CCC, Saucony, Nike-Fit/Dri-Fit, Nike TN, Champion, Everlast, Adidas, Puma, Lonsdale London, Pills, Winfield Blues, Marijuana, Graffiti, Raves, Gabber, Alcohol, Fighting, Crews (example: ALK - All Line Killers), Bumbag, In-Sport, Spitting, Acting Hard, Town Hall, Maccas, Shopping Centres, Pig-Latin, Eshays, Hardstyle, Rap
Lad 1: Wanna come for a sesh?
Lad 2: Fucken oath brah, eshays adlays.
by Town Hall August 18, 2008
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A young Australian man/boy, generally between the ages of 12 and 25, who, due to a lack of any real parenting or discipline, lack the social aptitude for any real friendly connection or meaningful relationships.

As they find it difficult to attract real people these individuals gather in large groups and prey on the small and the weak in an attempt to hide their inherent fear of their own weakness.

Easily distinguishable by their nautica, saucony, and other sporting brand clothing (ironic in that even the healthiest lad pulls enough cones and smokes enough cigarettes that even light exercise such as running from police and beating down 8 year olds with their mates tires them out); not to mention various other ridiculous clothing and hair choices such as the famed nike TN's, which take many dole payments to acquire, the nautica white cap, and, worst of all, the rats tail, which has in actual fact been proven to cause severe mental disability.

the lads female counterparts, known as "lasses" (luminary I know), are generally very similar to lads in the respect that their parents mistakes create a girl who, with no self respect or ability, allow these lads (many at the same time), to stick them with their miniscule, unprotected excuses for penis's.
this in turn creates a new generation who, with their teen parents unable to provide them with even the most basic education in any academic or moral sense, turn into even worse versions of the preceding generation.

this is a vicious cycle as this causes a rapid degeneration of social behaviour in sydneys western suburbs.

As already mentioned, lads are known to roam in large groups and single out those who they sense are weaker then they are (with 10 of their mates), this list of weaker people involves women (though in many cases they still get their asses kicked), elderly people (who still can sometimes successfully fight back), children (same goes), and the mentally and physically handicapped (im sure you can guess what this caption alludes to by now =P).

They can usually be found in three places, namely any train station, as this proximity to transportation allows them to mobilize to other towns for parties or gang bash/rapes, on the trains themselves, where they amuse themselves by playing rave music on their phones, attempting to pick up, and tagging, and finally, at every damn party i seem to go to, where they insist on fighting everyone.

it is unknown from whence the lads originated, however, in a few short years they have spread from the western suburbs of sydney to lithgow in the upper blue mountains. if this trend continues it could turn into a countrywide epidemic of massive proportions, but as soon as the NSW government passes laws legitimizing their eradication as vermin the issue will be quickly resolved.

Or so we can only hope.
words cannot describe just how massively lads fail
by Sir Badass Killington July 13, 2009
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Slang term for those Australian gangsters who they own the world. Easily recognisable by their fair skin, WHITE nike dri-fit hats (thats a must), polo ralph lauren, nautica, tommy hilfiger tshirts or sometimes nike tshirts. They also have those stupid baggy Everlast hoodies. They wear Nike shorts or tracksuit pants and pimp themselves up by wearing Adidas Bounce, or Nike Tunez shoes.
Lad 1: Oh yeah bra, lets bash up someone bra! Oh yeah, you like my new dri fit bra?

Lad 2: Fuck yeah! You're real lad bra!
by Da Barefoot 79 August 21, 2008
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A subculture of Australian youths who copied the CHAVS from the UK, They like to wear clothing such as Nautica,Nike,Adidas, Hoodies and wear white nike baseball caps peaked up,They like to hang out in shopping centres public parks drinking alcohol and taking drugs and harassing anyone who is smaller and weaker than them but run or back down as soon as you stand up back to them, So basically little men but big coats fit them
Normal Person 1:"Look at those idiots over there acting real hard because they're drinking liquor in the park and shouting out stuff at people"

Normal person 2: "Oh what do you expect look at them they're lads"

Lad 1 "Eh bra just got dis new push bike bra"

Lad 2 "Sik cun who'd ya roll for that"

Lad 1 "Sum lil 10 year old he even cried for his mummy"
by Harry69 June 10, 2009
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