Fellow who might go "Squee!"

Usage examples of fanboy.

I had done some interview work for fanzines as a nerdy fanboy in Augusta Georgia.

He's an alien from an interstellar civilization far more highly developed and advanced than our own, but not in that creepy sci-fi fanboy kinda way.

He was plainly embarrassed by his earlier show of fanboy enthusiasm, and was now over-compensating for it wildly.

Her earlier dismissal of him as a self-aggrandizing lowlife, a death-and-destruction fanboy, of whom she had met far too many, now seemed facile: there was something other than the normal mercenary brutalism going on behind that strange dark face, and Dulcie had to admit she was beginning to get interested.

The NERVA fanboys and fangirls, of which I confess to being one, wanted to play around with possible nuclear rocket landers.

On one level it's the story of three fanboys and a neophyte collector attending a comic convention, but when you add in the fact that gods are real in this world, the humor level quickly escalates.