Used to express admiration without negative implications, suggests enthusiasm but not obsession. She's a fanboy of indie music, always sharing the latest songs.
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Informal Usage
Mostly used in informal contexts like conversations among friends or on social media. At the lunch table, they realized they were all Marvel fanboys.
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Gender Neutral
Although 'boy' is in the word, 'fanboy' can refer to any gender; it's not limited to males. My sister is a total tech fanboy; she knows all about the latest gadgets.