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When someone tries to hard to be a guy when it should come naturally.

Symptoms include overenthusiasm over bacon, bragging about the time you fucked a fat chick, kitchen/sammich comments, starting off statements with "your not a real guy until...."
Guy: Bacon! Bacon! Gotta have me some bacon!

Girl: Was there some bacon famine recently? Why are guys jumping all over this all at once now? You have Guyitis so bad you probably jerk off to Entourage.
Guyitis by havalina June 30, 2011
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u just play fortnite so much u become a major virgin, a big enough one that u give up on going for girls, and settle down with going for guys as they are the only ones who will not sell or leave you on read
Friend 1: hey I just played so much Fort, I think I have a crush on my duo partner

Friend 2: u mean Jeff?

Friend 1: yeah...
Friend 2: that 100% gayitis
Gayitis by Bishop from Juice November 18, 2019
Related Words

gayitism 

Literally me! It means to be above beyond gay!
Wow! I am so gayitism! owo
gayitism by HAHA NO March 13, 2019
Gayitis is someone that is good looking. They’re either gay, or at least has gay features (high pitched voice, hangs with gays but is straight).

If the looks are appealing to women, gay men, and straight men who don’t want to be gay (pretty much everyone ); That means that they have Gayitis

How to stop, or avoid Gayitis. Spread rumors that harms the infector. So that people can hate the infector as a person.

Stay around people that fit your preferences. If you like someone who has Gayitis, you’re just Gay.
Another, but inefficient way is to avoid talking to the infector.

Another use for Gayitis is to insult someone as a joke.

Try using the first definition like “Wow he ACTUALLY has Gayitis” so not to confuse the 2 definitions.
“Wow that guy looks so good, I’m not gay but damn”

“He looks good, but I don’t swing that way

“Damn everyone thinks he looks good, I agree but I’m not gay

“Last one to there has Gayitis!”

“If you don’t do it, you have Gayitis”
Gayitis by Migleadon March 26, 2022
People who love the character Guy Gardner and have autism
they often like to speak bad about Guy Gardner for fun.
I have Guytism
Guytism by Batsy_thedarkknight November 26, 2025