A fan (human) who devoted himself to a particulair brand/series, and hardly questions whether it was the best choice. It usually points at a fanboy favoring a certain gaming comsole like the Nintendo Wii and Xbox360 over the opposing brand, yet also reffers to otaku
-like people who favor a certain anime series like Dragonball Z and
Yu-gi-oh, or Comic book brands like Archie and Marvel. Many other kinds of fanboyism excist, but these are the most common ones.
Fanboys have the reputation to hardly have a social life, run low on friends outside Massive Multiplayer
, to take their fanboyism quite seriously, and to be the cause of flame wars
on internet forums. Although this is quite stereotyphical, it's not entirly incorrect. Fanboys take it as a personal offense when someone (usually an opposing fanboy) ditches the other's favourite brand/comic/console/etc.. Whether he reacts or not is for the fanboy to decide.
Despite their reputation, fanboys are proud to be one, and it will take quite some dissapointment from the brand/system/anime/etc. to get the fanboyism out of his head. Not there is need to, since they prefer not to bother anyone, so they won't be bothered while feeding their obsession.