The satisfaction you get when learning something you didn't know before or to share something else with someone who didn't know about it before. Like a boner, but with your brain.
Mary: John must be the most common name in the world.
John: No, Muhammad is the most common name ever.
Mary: Oh. I didn't know that.
Tommy: Total brainer.
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brainer or brain boner is when something satisfies the mind in a way to the extent of giving a mental erection.
Jimmy: "hey Dave did you know that 69,000 + 420 = 69,420"
Dave: "Jimmy you just gave me a raging brainer with that one"
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person 1: I pulled my wee wee out and she did not want to suck it
person 2: yeah she is known as the only girl who doesn't give head she's a no brainer!
A word used by senior stagiaires who are trying to look cool. While the validity of the word is contested, it is accepted that the word is not used by anyone anymore, or at least anyone who you would consider to be cool.
Christine: This guy I know went did a degree in engineering and a masters in engineering and now he is in med school doing his residency, what a brainer!
Mat: What's a brainer?
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My buddy snuck up behind me and startled me with a brainer!
To produce a brainer, wrap your hand around your ballsac and squeeze, your nutsac will bulge out between your thumb and forefinger simulating the look of a brain
The act of exhaling Marijuana from one persons mouth to another persons mouth, to be then inhaled.
See also: Shotgun.
He man, give me a brainer real quick.
When you're attracted to somebody primarily based on their personality and mind rather than appearance (although that does help).
"That thing you just said was so cute. I have an erection for you, but in my mind. I have a brainer."
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