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To brain someone is to club them in the head with something, possibly until you see brain leaking out.
That was so sweet when she brained that guy with a brick.
brain by shellita November 3, 2006

Baby Brain 

A coworker who gets pregnant, and then for the next nine months you can't have a conversation with her that doesn't involve the fact that she is pregnant. Bonus for the ultrasounds pasted in her workspace, and the coworkers who fawn over the cuteness of said blob in In Utero.
Oh my god, I just just got back for my gyno, and look at these pictures!

/She has Baby Brain
Baby Brain by Allen Watts March 4, 2009

brain ninja'd  

A medical term used to describe when an extrodinary woman leaves you speechless.
Ben: You always ignore me when I call you.
Brittany: Ya well you never leave a message
Ben: (speechless)
Brittany: Ya you've been brain ninja'd !

BRAINAL PENETRATION 

When you find someone incredibly intellectually stimulating and you want them to penetrate your mind further or you wish to penetrate theirs.

Completely intellectual attraction, without physical or emotional attraction. A desire to be mentally close to someone.
The opposite of to wanting to pick your brain ie wanting to have your brain picked
"I met this guy the other day, he's not my type, but the converation is amazing, he really understands me... It's like we were having brainal penetration."
BRAINAL PENETRATION by Moo Lavaca October 27, 2010

brain jizz 

The intellectual goo that is secreted in the hypothalmus when one experiences an epiphany leading to euphoric pleasure (also known as braingasm).
Dude, when I saw that kitten, I realized the meaning of life, and I got brain jizz everywhere.
brain jizz by Voodoo Karate December 18, 2010

galaxy brain

seeming compliment turned sarcastic insult. used often by leftists to insult of excessively stupid or shortsighted Neo-Liberal hot takes on current events, history, policies, or other politically relevant matters. derivative from the expanding brain meme, where the most absurd position/behavior/belief is derisively paired with the largest brain.
neolib: see, venezuela is collapsing, socialism never works. is that place the utopia you want?
lefty: galaxy brain position to think that country is even socialist.