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Fanboy is a term used to describe an individual (usually male; the feminine version fangirl may be used for females) who is utterly devoted to a single fannish subject, or to a single point of view within that subject, often to the point where it is considered an obsession. Fanboys remain loyal to their particular obsession, disregarding any factors (often including logic) that differ from their point of view. 

 Background 
Stereotypical fanboys are attributed with a sycophantic devotion to the creators and principles behind a work with which they are currently enthralled. Fanboys are noted for a very emotional attachment to their chosen subject, often taking negative remarks about it as a personal attack. They will readily engage in debates, but will fall back on emotional responses when challenged on facts. For example, a fanboy may go out of his way to point out negative and often untrue statements about their obsession's rivals. Fanboys are often hostile towards critical review of their chosen subject. The stereotypical image of the fanboy is as an unkempt, socially awkward young man who may be perceived as a loud mouthed pseudo-intellectual. Fanboys  are also typically aggressive and hateful towards the opposing brand or competition of their obsession regardless of its merits or achievements. 

As electronic entertainment gained popularity, the term became increasingly applied to video game and television addicts. As a result, a subculture emerged which readily labeled itself as ""fanboys."" Within this group, more effort is taken to fit in with a perceived standard, resulting in a more outgoing attitude, even among those with insecurities. This outgoing stance is often felt to be abrasive by those not involved in the culture as deeply. The term originated in comic book circles, to describe someone who immersed himself in the fictional worlds of comics and the culture of comics fandom.  The term is often used in a derogatory manner by other less obsessed fans. The term is most commonly associated with adolescent and teen males but can be applicable to any age or sex.

The term fangirl, while similar, often carries slightly different connotations. The term fangirl is often applied to any enthusiastic female fan, regardless of obsessive qualities or not, and is often used with overtones of ""teenybopper"".

History of fanboys and the term
The term ""fanboy"" is most commonly associated with adolescent and teen males but can be applicable to any age or sex. It is often used in a derogatory manner by other, less obsessed fans. The term originated in comic book circles to describe someone immersed in the fictional worlds of comics and the culture of comics fandom. Common subjects of reverence by fanboys are specific: TV shows; movies; music; anime; comic books; cars; video game consoles, video games and MMORPGs; and computer operating systems, hardware and software.
 
Popular depictions of Fanboy stereotypes include the Comic Book Guy on The Simpsons and columnist Larry Groznic from the satirical newspaper The Onion.  In the songs of the fannish parody musician Luke Ski, many characters proudly consider themselves fanboys.

The earliest published uses of the word ""fanboy"" have been dated to 1982.  One reference is to the cover of the ""Official Underground and Newave Comix Price Guide"".  On this cover page are sketched overweight, overzealous comic book collectors wearing T-shirts that state ""Fanboys of America,"" who are describing the extreme measures they would go to, including moving to San Francisco, to preserve their comics.

Also published in 1982, a comic strip appeared in Jim Engel and Chuck Fiala's ""Fandom Confidential"" comic.  In the strip, Jim and Chuck met comic artist/writer John Byrne and collapsed into ""mindless paroxysms of adoration.""  The John Byrne character responded that they were ""a couple of fanboys in bondage"" (a play on words referring to a Monty Python sketch in which an Elizabethan era character reads what she claims to be a new Shakespeare work called ""Gay Boys in Bondage"". http://www.byrnerobotics.com/FAQ/listing.asp?ID=7&T1;=Miscellaneous+Questions#154 Another early use is in a smart-alec editorial reply by ""Ambush Bug"" to a letter in his comic in 1985.

Media
Comic Book
Sergio Aragonés' Fanboy
Galactic Storm       Fanboy

Television
The Simpsons'''s Comic Book Guy refers to himself as a fanboy.Freakazoid'''s Fan Boy

===Radio/Podcast