Giving oral sex to a man (giving head).
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When you stop functioning correctly because you have fried your brain trying to study for finals.
A: "Then I have to psychology for study."
B: "What?"
A: "I meant to say, I have to study for psychology. I just can't speak correctly."
B: "You just have finals brain."
When someone has large rocks in place of an actual brain
"Panglou i can't believe you're that stupid, you have rocks for brains"
A person with kids who is oblivious to everything besides the fact that they've procreated.
Mom: Oh I know I'm living in squalor but I just love kids! And I'm going to get pregnant for the 5th time regardless of my situation! It's a miracle!
Normal person: Wow that bitch is a real breeder brain.
What happens when you've had so many carbs for lunch (or not) that you can no longer function properly.
I'm sorry I forgot (insert the stupid thing that you did that you are apologizing for here). I had lunch brain.
Crow Brain , keeps shiny and useless things or things to put shiny things in.
see "pack rat". keeps anything shiny and mostly useless "i am such a crow brain, i keep old jars"