Slang term for something important, significant, or a person of importance; 'no biggie' means no big deal.
From 'big' (large) + informal diminutive suffix '-ie.' It's contemporary slang, emerging in English-speaking countries in the mid-20th century.
It's wild that we added '-ie' to 'big' and got the opposite meaning: 'biggie' can mean 'big/important thing' *or* be dismissive ('no biggie')—the same word shape carries contradictory attitudes depending on context.
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