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One who goes to extremes.
1. a thorough or thoroughgoing person or thing
2. a person or thing that is excellent of its kind
3. an extremist
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|Noun||1.||out-and-outer - someone who is excellent at something|
jargon, lingo, patois, argot, vernacular, slang, cant - a characteristic language of a particular group (as among thieves); "they don't speak our lingo"
expert - a person with special knowledge or ability who performs skillfully