out-and-outer

American  

[out-n-ou-ter, -nd-ou-] / ˌaʊt nˈaʊ tər, -ndˈaʊ- /

noun

1. a person who does things with excessive thoroughness; extremist.

2. a thoroughgoing or perfect example of a kind.

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out-and-outer British  

noun

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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Etymology

Origin of out-and-outer

First recorded in 1805–15; out-and-out + -er ¹