An extreme fan or follower of a particular medium or concept, whether it be sports, television, film directors, video games (the most common usage), etc.

Known for a complete lack of objectivity in relation to their preferred focus. Usually argue with circular logic that they refuse to acknowledge. Arguments or debates with such are usually futile. Every flaw is spun into semi-virtues and everything else, blown to comedic, complimentary proportions.

Known for using the phrase
"Object of affection = Best Ever"
However, while people only really say that as hyperbole, fanboys truly believe it.

Troll the internet to spread the gospel.

Insult/chastise others for using public forums to express an objective opinion, no matter how constructive or, respectful it may be. (Go ahead and admit that it's a good game/movie/etc. This fact and anything else will be promptly ignored in favor of cherry picking the negative, and beating you over the head with it.

Tend to resort to petty annoyance replies when backed against the wall. Usually grammar attacks and non-replies.
"Final Fantasy VII is the best RPG ever!"
"Ocarina of Time is the best game ever!"
"Linux is the best OS ever!"
"Xbox is the best console ever!"
"Dragonball Z is the best show ever!"

The sad thing is, fanboys don't realize, that these companies that fuel their passion, don't really give a damn about us. To me, defending a multi-national corporation like their your own family, is ridiculous. These organizations don't come to your house and help you when you're sick, they don't help you move, or drive you to the airport. They don't support you in any way. It's a business, not a friendship. As soon as you can no longer buy their product, you disappear to them.
by Lig Na Baste July 10, 2008
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A fanboy is any person who is the unthinking pawn of a major label/brand. A fanboy is just about the most annoying creature on earth, particularly in the heated debate of Mac vs. PC or in the realm of politics. They tend to be really irrational, and unwilling to look at both sides of the debate: repeating things by rote and being completely partisan. Also, the typical fanboy is totally uninformed and biased to a precedent, hence the repetition of rote sayings or facts/myths.
Mac fanboy says "Apple can do anything! Even make an edible iphone, if only to prove they can do anything!!!!"

PC fanboys says "PC for the win!"/"Mac's may crash less but their crashes are worse!"

both tend to be dumbasses
by thorhizzle May 03, 2009
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The rare form of the fangirl interested in celebrities and fictional characters as well as "geek cultures" (Doctor Who, Star Trek, etc.) If you find a fanboy you should contact the nearest fangirl immediately, as they are an endangered species.
"Hey check out my David Tennant trench coat, I got it for coaplaying this weekend!"
"Dude, I didn't know you were a fanboy!"
by Aim Hemmings July 01, 2015
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Someone far beyond a simple fan.
No, not the tye of fan which keeps people cool.

An arrogant person who goes into an outburst every time something he likes is questioned. Fanboys usually acuse others of being fanboys. Usually use 1337 and swarm MMORPGs. Fanboys caused alot of fallouts between people when they started arguing about consoles. If you insult something that a fanboy likes, he will spam your computer up and try to insult something that you like. Most words a fanboy uses are in 1337 or end with 'X0RZ' and they spell the work 'the' as 'teh' because they think that it is 'teh ro><0|2Z!!!'
e.g. Counterstrike is teh rockxorz!

Fanboys usually use the word 'own3d' if they beat someone.
Another annoying feature of a fanboy is that if he is loyal to a console, he usually goes to rival console forums and spams the place up with inults about how his console is 'better'.
They take the 'console war' very seriously, as if it's a real war.

(Although I'm a Nintendo fan, I hate Nintendo fanboys who can't shut up because a Sony fan said that Nintendo is for kids. Dude, chill out, the console war isn't a real war!)
Sony Fanboy: omg n00b nintendo is teh suckx0rz becasue its games are for kids because they dont have 100% violence! etc. etc.

Nintendo Fanboy: STFU N00B NINTENDO |2O><0RS SONY, TAKE AWAY GTA AND YOU CAN'T SAY ANYTHING! NINTENDO ISN'T FOR KIDS BECAUSE NINTENDO HAVE BEEN GOING FOR 100 YEARS+ etc. etc.

XBOX Fanboy: STFU BOTH U N00BS! XBOX is owned by microsoft the richest company in the world, you both suck!

Neutral Fanboy: OMG I DIED ON COUNTERSTRIKE WHILE I WAS MACROING! I MUST HAVE BEEN HACKED! I'M REPORTING TO GAMEMASTER!

All fanboys: OMFG U WERE MACROING N00B IM TELLING GAMEMASTER!
by Arran January 03, 2005
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One who is loyal to something, usually a company or manufacturer of some sort, no matter what.
Look at those fucking Corsair fanboys. Pathetic.
by ☢_☢ August 14, 2009
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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 person who is overly obsessed with a certain company or franchise and will defend it from any person who dislikes it no matter what. To see a person that likes a company or franchise, but isn't completely obsessed with it, see fan.
Two friends are having a conversation at the mall.
Friend 2: Dude, have you seen the latest Smosh video?
Friend 1: Nah. I used too like Smosh, but now they're just recycling jokes to make more money.
*Another guy hears Friend 1's complaints and runs up to him*
Guy: SMOSH ISN'T RECYCLING JOKES!!! THEY'RE STILL ORIGINAL AND WILL BE MORE SUCCESSFUL THAN YOU'VE EVER BEEN IN YOUR LIFE, YOU IGNORANT JERK!
*The guy runs away from the two friends, screaming and yelling*
Friend 2: Yeesh, what a fanboy.
Friend 1: Yeah, he was so butthurt. At least I'm not as fanboyish as hi- OH MY GOD IS THAT A NEW POKEMON GAME? I LOVE POKEMON!
Friend 2: I don't know why I'm your friend.
by ThatPyro July 16, 2015
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