A fanboy is a male person who's a big (kinda obsessive) fan of something. Fanboys often tend to know everything about the subject they're a fan of. When someone accidentally talks about the subject a fanboy is a fan of while the fanboy is within hearing distance, then that someone should run. RUN!
Someone: I just saw the first episode of my hero academia. It was kinda fun.
Fanboy: *20 feet from the conversation* DID SOMEONE SAY MY HERO ACADEMIA!?
Someone: *screams* NO! *whispers* Dude, we have to go. There's a... A f a n b o y near us
Friend of someone: Oh shi dude
Fanboy: *appears behind the two dudes who were having a conversation* Hi! So, my hero academia you said?
The two dudes: AAAAAAAAAAAAAAAAHHHHHH
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