Definition of "fanboy"

(It's in the nature of comic book fanboy obsessiveness that all of these Eras and Ages and such have been religiously chronicled; it's equally in their nature that no two fanboys can ever agree about anything about any of these Ages and Eras; everything is up for debate, eternally and in microscopic detail.)

1988 August, Bart Bull, “Comics”, in Spin, volume 4, number 5, page 41

Six years and seven titles later, their company, Top Cow, is the third-biggest-grossing comic line, thanks mainly to a pair of blood-soaked, modern-day Gothics that have been a hit both with fanboys and a growing number of women.

1998 September, Brian Doherty, “Exposure: Tales From the Dark Side”, in Spin, volume 14, number 9, page 108

Apple fanboys have always devoted equal parts of their mind to genuine reasons to praise their chosen corporation, and to blindly ignoring its faults.

2008 December 10, Tim Barribeau, “What's so great about Macs?”, in The Sydney Morning Herald‎, archived from the original on 22 April 2014

James has a tendency to fanboy when something he likes is done wrong.

2013, Rowan Lake Jr, Heaven Fighter Angelon‎

To Yusef Komunyakaa, thank you for […] tolerating my fanboying when, by luck, I sat down beside you one rainy night in a West Village theater […] and kept yapping about everything and nothing at all.

2019, Ocean Vuong, On Earth We’re Briefly Gorgeous, New York: Penguin, [Acknowledgements]