*stifles a laugh*
a fan boy, or girl, if you will, is a person either utterly consumed by the movie/game/movie-game franchise they adore. They are often overly enthusiastic, have a tendancy to write crappy fanfics, and are, for the most part, virgins.
"The fanboy dresses as Manny for Halloween"
"The fangirl hangs posters of Guybrush in her room."
"The Orca kills fanboys who flirt with her."