When something is extreme. It is sometimes shorten to just 'hard'.
Conan - Craig has drunk 34 beers and all of Pats bourbon.
John - He's Hardk0re!
Pattus - NO, he's a dickhead.
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the word harcore to the millionth power.
Bob: Dude, he's so hardk0re!
Joe: Yeah I know, I wish I was like him!
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