Fullmetal asshole

Definition

A fan of the anime Fullmetal Alchemist who is so annoyingly obsessed with the series that they dismiss all other shows as inferior and gatekeep the fandom aggressively. Think of them as the anime equivalent of the guy who won't shut up about why their favorite band is objectively better than yours.

Example Usage

Don't even mention Attack on Titan around Marcus—he's a total Fullmetal asshole and will spend an hour explaining why FMA is the only anime that matters.

Source: Urban Dictionary (https://www.urbandictionary.com/define.php?term=Fullmetal%20asshole&defid=904180)

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