Big brain

Used to describe someone who actually does something smart.

“Wow ur so big brain”

by Luciana1234 December 19, 2021

Car Brain

An American living the suburbs who is incapable of thinking about getting from place to place without taking his or her car. Complains about safety on transit all the time, and opposes all "socialist" transit projects, even though it would benefit them without the carbrain needing to take action. May alsoo be a NIMBY, but not necessarily, and should not be used interchangeably.

Person 1: The subway is filled with druggies and homeless people. In my car, I'm in my own safe bubble.
Person 2: You are SUCH a fucking car brain!

by URBANist_ November 3, 2025

Quarantine brain

When you are physically cut off from everyone and everything but overwhelming connected into everybody else's stuff

#1: That lady was a total Karen
#2: Yeah and she was all wound up on quarantine brain reading conspiracies and shit.

by Snakevon February 19, 2021

Runner's Brain

A temporary reduction in mental capacity due to having recently run several miles.

After my run yesterday, I spent half an hour wandering around the grocery store trying to decide what to eat for dinner, only to remember that I had just gone to the grocery store that morning. So then I went to In-n-Out. I think I'm coming down with a case of Runner's Brain.

by An Avid Runner April 8, 2013

Juul Brain

When you have way too much nicotine in your system.

Person one: Damn man, Andrew hit 8 juuls at once! Now he has Juul Brain.

Person two: holy shit, he's a god.

by TheCyptidFiend October 26, 2018

SkullFuck Brain Surprise

What happens when I sniff Grag

Shit MuckyClaire that seriously SkullFuck Brain Surprised me!

by MuckyMike November 4, 2010

Vanilla Brain

when the receptors in your brain have been gloriously untouched by things like recreational drugs and excessive video gaming, and thus remain sensitive to serotonin and dopamine.

Coworker 1: "yo why the fuck Sarah always writing motivational sayings on the whiteboard during break?"

Coworker 2: "oh, she got vanilla brain bro"

by Breadboibraincell June 7, 2022