Fanboy
Fanboy definition by Slang.net - The Slang Dictionary
This page explains what the slang term "Fanboy" means. The definition, example, and related terms listed above have been manually compiled and written by the Slang.net team.
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A slang word for a guy who's a huge fan of a sports team, celebrity, etc.; often a person who owns lots of paraphernalia and perhaps a costume or two.