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Verb= when you brag like a madman about how awesome you are, telling wild stories where you're the only hero and everyone else is a total loser. Noun= a self-centered freak who thinks they're the best at everything and everyone else is trash.
DM: 'I singlehandedly defeated 100 enemies in a cave. No one else was even there.'
Tweet: 'I saved the world during lunch. No one believed me.'
Story: 'I fought a dragon with just a spoon and won.'