perma-teen brain 

Not fully developed; No matter one's age, still acting pre-teen to teenager attitude. Drama-oriented attitude, naturally dramatic

she may be 50, but she's got a perma-teen brain, still trying to cause adolescent drama, she still hasn't matured.

perma-teen brain by kandiekay February 20, 2011

Think Outside the Brain 

A wittier version of the non-innovative cliché "think outside of the box". This sarcastic phrase should not be confused with other idioms such as "use your intuition", "go with your gut", or "process sensory data with your spinal grey matter".

Boss: If you can't think outside the box you'll be downsized.
Employee: Will I get your job if I think outside the brain?

Think Outside the Brain by Puppet Villain August 13, 2014

baby bitch brain

person with small brain

"you have baby bitch brain"

baby bitch brain by babybech April 12, 2019

No aim no brain 

Term to describe tactical shooter(FPS or TPS) gamers who who do not possess the skill to competently wield a weapon at even an average level nor understand the mechanisms of a game past surface level understanding and oblivious of basic concepts making them inept as a player thus making them No aim no brain

Term to describe tactical shooter(FPS or TPS) gamers who who do not possess the skill to competently wield a weapon at even an average level nor understand the mechanisms of a game past surface level understanding and oblivious of basic concepts making them inept as a player thus making them No aim no brain

No aim no brain by Geiskahnawj January 23, 2020

Gold fish brain

Alyssa Leah Portillo

Damn nigga you have a gold fish brain.

Gold fish brain by Tmnt344 February 11, 2020

gec on the brain

the state of being addicted to 100 gecs and their overall existence

"Why do you keep blasting 100 Gecs on repeat? Change the damn song already."
"Sorry man, I got a gec on the brain"

gec on the brain by cringealexmain October 19, 2020

having a brain 

being someone who has a brain.

meaning you have a brain,
might also mean you are a normal human with a brain.

you might be called brainless / braindead if you're stupid or did something stupid.

i own a brain, i like having a brain, so don't fuck it up

having a brain by Fry On HY November 19, 2020