Giving oral sex to a man (giving head).
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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.
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.
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"
The notion that sometimes the functioning of even our own brains is confusing and inexplicable. Kind of like every cat - in part generalizable, and in part hilariously unpredictable.
You want to make a poster of your cat? Well that is a fuzzy brained idea!
A male who thinks with his dick rather than his brain. Follows what his sexuality says to do instead of taking the path of common sense or intelligence.
"Can you believe John? That's the third girl he's screwed this week and he's SUPPOSED to be dating Stacy!"
"He must have nuts for brains."