Josh Brother Syndrome 

A congenital condition that the tentative editorial DSM-VI defines as a high level of confidence in ones own abilitiy and game knowledge to the point that it is detrimental to those surrounding them, coupled with a immediate breakdown when faced with adversity/a single failure. Once faced with failure the psychologists agree the primary coping mechanisms used are "unhealthy self-soothing"(imbibing alcohol) and "compulsions and risk taking"(rushing long A with Galil on save round).

The root cause of this syndrome stems from a down-regulation of dopamine and seratonin receptors(calcium channel deactivation) when the stimulus of "being the best" becomes absent. Down-regulation has also been found to occur when engaging in an activity where new stimulus is not being presented as frequently as every 7 seconds. Alcohol has been shown to improve dopamine reuptake but lower game sense, resulting in a net zero effect on executive function ability.

Total Cases among populace: 2 out of 7.89 billion

Discord friend 1: Bro, you should have tried to block that ball.
Josh Brother 1: Have you considered rotating behind me?
Discord friend 2: Sure...
Josh Brother 1: I have to get off after this game, my girlfriend etc.
Discord friend 2: I am going to find a friend without Josh Brother Syndrome, bye

Josh Brother Syndrome by 1_SHOt December 10, 2023

Annoying Little Brother Syndrome (A.L.B.S) 

Always at least a second child.
Usually tattles
Constantly steals the spotlight
Gets blamed by all older siblings

You know I'd like to go to the club, but my super Annoying Little Brother has some kind of Syndrome or something. I can't get over how whinny he is, and he's such a little snitch, he'll just tell my mom or dad. Stupid Annoying Little Brother Syndrome (A.L.B.S)

Annoying Little Brother Syndrome (A.L.B.S) by AUnknownSeaUrchin December 13, 2023

Big brother meat head syndrome 

When you become so buff meat starts spreading to your brain and you don't know how to think anymore. You also starts drooling and sweating when ever you try to think, signs and symptoms would be saying the word dur consecutively and you begin having trouble forming proper sentences.

man after Wilson went to the gym he started developing big brother meat head syndrome

Big brother meat head syndrome by Gym Teacher Mr. G September 7, 2018

Mario brothers syndrome 

The act of making stupid mistakes over and over (usually at the same point) while trying to perform what should be a simple task. This most likely happens when doing things in a rushed manner.

Mario Brothers Syndrome:
Basically, in the original Super Mario Brothers for the Nintendo Entertainment System, trying to get through certain worlds hastily causes errors on the players part. Like hitting a turtle sideways and dying instead of jumping directly on it.

Mario brothers syndrome by Trace Faulkner October 18, 2008