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Someone who is considered 'hardcore casual', is someone who is hardcore into a limited number of works in a genre, category, or group.

They will obsess over one or two works, fail to acknowledge other media within the genre, and still act like they're superior.

Basically; they're posers.
(Girl has Death Note bag, Soul Eater purse, and One Piece lanyard.)
Her: "Oh man, I love Death Note, and One Piece, and Soul Eater."
Me: "Eh, they're alright. Have you seen Fullmetal Alchemist?"
Her: "Never heard of it."
Me, leaving: "Fucking hardcore casual."
by pinkguysbeard January 18, 2017
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