Minnesota brain freeze 

Getting a blowjob in an ice fishing hut on a frozen lake

1: Hey did you hear what happened to steve last night?
2: No what?
1: He got a Minnesota brain freeze from sally in a fishing hut last night.

Minnesota brain freeze by anonymous November 17, 2020

Lego brain 

An insult for someone who can't put the pieces together.

Someone who is stupid.

You're such a lego brain.

Lego brain by Th3realdookieman November 22, 2020

Omelette Brain 

This phrase has multiple definitions: 1. You have made a small error due to incompetence or defect. 2.You have made a large error and are worthy of institutionalisation. 3.You are brain dead and require constant help and support to get through the day.

*Emily tries to unlock a BMW with her Toyota Echo car keys.
Richard: Damn it Emily! Your Omelette Brain is getting worse!

Omelette Brain by anonymous November 27, 2020

Big-brain 

Big-brain, (Which can also be spelled without a hyphen,) means smart, intelligent, and is usually used when someone says something witty in an argument.

Maddie is really big-brain for saying that!
Or
Maddie is really bigbrain for saying that!

Big-brain by ~Chrysanthemum~ December 2, 2020

Smol brain 

Yes

Smol brain Yes

Smol brain by Trefka i Monki December 3, 2020

small brain genius 

you're dumb but you do something smart for once

that dude over there is a small brain genius, he accidentally poured some substance into whatever tf that is and created it into a new material.he is getting the nobel peace prize rn

small brain genius by RadicalMuffin December 6, 2020

finance brain

When you cannot spend money without thinking about how much it could have been worth in 5 years if you had invested it. Related to but different than gambling addiction.

Karl: I bet if you spent 150$ taking Sally to a nice dinner she would play “hide the salami” with you
Me: Bro, I can’t... I have finance brain

finance brain by RawnieJay December 16, 2020