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Game brain

A self-inflicted developmental disabilty of millenials, caused by chronic digital media addiction, and characterized by short attention span, quick frustration, indiscipline, fatigue, and inability to absorb verbal information.
Doctor: I'm diagnosing you with game brain, probably caused by 2,000 hours of World of Warcraft, and exacerbated by 1,000 hours of GTA. I'm writing you a prescription for methadone. With treatment, you may one day be a person again.
by a j a x March 15, 2017
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Grug Brain

Someone who has a very primitive thought process
Homo Sapien 1: "OOOOO fire look so cool."
Homo sapien 2: "You're such a Grug Brain."
by crazyfortniteman October 31, 2021
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brain afterbirth

A loose measurement of how stupid, ridiculous, or retarded something is.
That kid has too much brain afterbirth.

The amount of brain afterbirth in that video was astounding.
by Zebora September 21, 2017
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Boner Brain

The phenomenon when a males mind becomes filled with extremely sexual thoughts when one has a boner. In other words a person thinks with their boner.
I had a serious case of boner brain in class and almost spunked my pants thinking of fucking Ms. Williams
by TadBitOfThad May 11, 2015
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brain fart

momentary mental lapse as when you see someone familiar but forgot their name the instant you were going to say hello
Lover 1 Susan: Oh John that was sooo good!

Lover 2 John: Ohhh yeah, uh, rats I just had a brain fart. Damn what's your name again?
by no1sandman August 1, 2010
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Penis Brain

A person who thinks with there penis.

A guy who just wants to have sex.

A man who is horny all of the time.

A guy that thinks only with his penis and of his penis.

A man who believes everything in life can be in some way relative to the human penis.

A man who uses his penis to hide the fact that he has no skills in getting women.
"My ex boyfriend was such a penis brain, all he cared about was sex"

"Why do you always have to be such a penis brain? All you think about is your penis!"
by Suckmycockerspanielbitch69 October 7, 2008
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calculus brain

the negative effects that your brain experiences after doing excessive amounts of calculus homework
After finishing his mountain of calculus homework, Ted was craving donuts, walking into walls, and mispronouncing things. Upon awakening and remembering that he dreamt of finding the integral of tangent to the fifth power, he realized he had severe calculus brain.
by Doctor. Q September 19, 2011
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