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2.
1. A person who is completely loyal to a game or company reguardless of if they suck or not.
2. A pathetic insult often used by fanboys themselves to try and put down people who don't like whatever it is they like.
3. See fool or SEGA.
"If you don't worship SEGA and send them all your money and pay $500 for the copy of Panzer Dragon I'm selling on ebay then your obviously a Sony fanboy even though I've never heard you mention a single thing about Sony the entire five minutes I've known you." Said the SEGA Fanboy.

"Yeah but the SNES didn't have Blast Processing" Said the Sega fanboy.

"FF7 sucks" Said the
SEGA Saturn fanboy.
by Sega Slayer June 26, 2003
 
1.
A passionate fan of various elements of geek culture (e.g. sci-fi, comics, Star Wars, video games, anime, hobbits, Magic: the Gathering, etc.), but who lets his passion override social graces.
At the mall I almost got mowed over by some Dragonball Z fanboy on his skateboard.
by Paul Horn August 22, 2003
 
3.
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
 
4.
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 FlowersInMidgar2 July 10, 2008
 
5.
A person who loves something without question.
Martigen is such a fanboy.
by bah January 27, 2003
 
6.
(n) Technocratic zealots; evangelicals of geekery. Characterized by irrational advocacy of a particular OS, console, company, or franchise.
Most commonly used to delegitimize contrary opinions in gaming forums.

Ex. "Waht the #@%? Darkrev0r jus a nintendo fanboy dont bother with him."
by Dr Know March 08, 2005
 
7.
A way to remember conjunctions.

"So my teacher taught me that 'FANBOYS' is a way to remember conjunctions..

F or
A nd
N or
B ut
O r
Y et
S o
.."
by RichardFanx3 October 02, 2005