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A total win so big it makes other people look like failures. Usually done by someone who’s got skills and a bunch of hot dates.
That kid aced the test and won the championship. Total lachlanporteous.
He scored the winning goal and still had time to flirt with the referee. Classic lachlanporteous.
She got straight A's, graduated top of her class, and still had time to text her ex. That's a lachlanporteous.