A student who excels academically and in extracurricular activities, often at a competitive school.
From Canadian English, originating in the late 20th century at Upper Canada College; derived from the idea of a student who 'charges ahead' like a bull, or possibly from the Latin 'bullae' (seals of honor worn by Roman children).
The term 'buller' is almost exclusively Canadian and virtually unknown elsewhere, which shows how regional slang can thrive within specific educational communities—it's essentially the Canadian version of 'overachiever,' but way cooler.
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