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1. Someone who is male and obsessed with a show, comic, movie, band, etc. They know everything about it and will take any chance to talk about it.

2. Someone who is male and very nerdy and geeky. They often write fan fiction or draw fan art of their obsessions.

3. Someone who is very stubborn and will defend the franchise of their obsession with their dying breath. Can often be obnoxious and unopen to other opinions, often a teenager or young adult.

Most fanboys are one of these or some combination of all of them. They're often neurodivergent in some way and spend a lot of time online interacting with fellow fans. Common fandoms are Star Wars, Star Trek, Dr. Who, Twilight, Divergent, Hunger Games, and Harry Potter just to name a few.
Noun:

Person 1: I love this band so much I bought alllll their albums. *proceeds to tell you all about every band member in great detail and how awesome they are*
Person 2: Omg you're such a fanboy

Verb (fanboying):
"Aaaaa the new comic just came out it's so good I'm fanboying so hard!" *squees*
Fanboy by childofthefence April 30, 2024
Is a strawman gaming slur used by those who can make a valid argument.
look at that fanboy saying PlayStation has outsold Xbox every generation.
Fanboy by NeoReaper February 4, 2025

fanboy and chum chum 

the most fucking stupid show that nickelodian has squeezed out their ass yet. the characters look like pieces of shit that have been reanimated, and its crappy animation anyway. it is largely unfunny and very sad. this is by far one of the worst shows nickelodian has come up with yet, and i saw icarly. anyone who says this show is funny obviously has now idea what good humor is, and should have hot metal rods forced up their assholes until they come out their mouths.
is that hanna montana singing justin beiber's songs?
no, its fanboy and chum chum

fanboy fine 

The extra price some stupid fanboy spent on products from their favorite company .
Fanboy: “I really trust g skill so I spent $100 on a ram kit that you could’ve gotten cheaper from Corsair. But hey, fuck them.”

Normal person: “You stupid wasteful asshole paying the fanboy fine.”
fanboy fine by Not_Benei June 25, 2020

fanboy funk 

A smell that emanates from a fanboy. Usually due to a lack of hygiene.
That is some serious fanyboy funk, he probably hasn't showered the whole week!

Fanboy/Fangirl 

Fanboy/Fangirl: Noun

Definition: A person who has a compulsive dedication to a videogame series, anime series, and/or music artist.
"Yeah, he's such a fanboy. All he talks about is Halo 2."
Fanboy/Fangirl by Danny Play September 7, 2005