An fucking annoying turd that loves something so much he hates everything else. An example of a fanboy would be attacking the comments in a versus video e.g. minecraft
Fanboy: AHAHAHAHA OMG MINECRAFT A SO AWSEM I DIED DI GIT IT HAHAHAHAH I LUVE IT IZ HAZ AWSMZ STAFF!!!
Me: shut the fuck up dumbfuck
Fanboy: AHHAAHAHA NO MINECRAFT IS WAY MORE AWSM THAN RUNESCAPEHAHAH HAHAHAHAHAHAHAH
Me: I don't even play runescape
Fanboy:......
by Psychotic looser February 01, 2015

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A universal term for anyone who likes something that you don't like.
"Battlefield *fans* are much smarter than stupid COD *fanboys*."
by PurpleSfinx October 08, 2011

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One who is committed to a specific subject in a genre of popular culture such as comics, videogames, movies, ect.. in which they will defend the subject, devoid of any proper constructed criticism.
A fanboy may defend the new Star Wars movies, believing them to actually be good, despite their obvious lack of quality and intelligence when comparing them to the original trilogy. In a recent example, Harry Knowles (of aintitcoolnews.com) in 2002 claimed that Star Wars Episode II: Attack of the Clones was the best Star Wars movie to date. Did he really mean that Attack of the Clones was better than The Empire Strikes Back (agreed among many to be the best in the series)? Was Harry's statement made just so he could claim he had the minority opinion? Perhaps not, but his devotion to the Star Wars movies at the time influenced his statement a great deal, and further implemented his way of thinking. In the end, fanboys, such as Harry Knowles, will always believe that the next installment in a franchise will be better than its predecessor; thus no matter how bad something is a fanboy will always like it.
by Tim O'Malley June 06, 2008

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Plural 'fanboys.'

A male variety of fangirl. These are males of any age though usually teens that are obsessed with anime and will often turn rabid over getting the latest copy of their preferred manga. Unlike a fangirl, fanboys tend to be a little calmer but will still start an online or real life war with you if you say anything bad about the anime/manga they like.

A fanboy will either streotypically be into mostly female characters with big boobs or strong personal or mostly epic male characters which they cosplay.

Some fanboys are however tame and enjoy detailed conversations about the thing they are a fanboy of and are open to suggestions of other things they might enjoy (unlike those who are so stubborn they think anything they haven't heard of must be rubbish)

They can be see with badges/stickers/keychains of characters, reading or drawing manga or playing computer games on hand-held devices.

Fanboys can be a fan of yaoi or yuri but will be unlikely to admit being into yaoi.

Not to be confused with an otaku or a weeaboo as fanboys don't have to be obsessed with something Japanese but dominantly are to a respectful if scary level.
Boy A: I really like Bleach.
Boy B: I know, you're a total fanboy.
by EndlessHetalia January 15, 2012

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informal derogatory: A term used to describe people who bought a product that competes with the one you bought, which is probably more popular than your choice, for reasons that you wish to discredit or diminish because you’re secretly afraid or upset that you made the wrong choice.

ORIGIN from fan + boy.
You bought a brand new Macbook Pro? Whatever, your a fanboy, I'll stick to my Acer.
by AceHendo April 11, 2011

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A common phrase uttered among Kevin Smith fans. Can be used in place of "fuck you" or anything to that nature.
Tell 'em, Steve Dave!
Fuck you, fanboy!
by D0Z October 17, 2004

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Star Wars super fan. Derived from the movie "Fanboys" released in 2009. The plot consists of 4 boys and 1 girl, obsessed with Star Wars attempting to sneak into George Lucas's house in order to watch Star Wars Episode 1 before anyone else.
Windows: Stop humping. Please stop humping. Just high five.
Hutch: Oh, God. I'm Jabba the Hump.

-Fanboys 2009
by serpentdancer February 06, 2013

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