when you're excited to learn something new, eg. math, science. it's basically a boner in your brain a.ka brainer.
professor farnsworth: all of this knowledge is giving me a raging brainer!!!
by soma689 April 25, 2013
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A dumb question or response. Something one shouldn't even have to think about it.
Dude1: Hey, man, where's the basement?
Dude2: Try downstairs, bright spark!

Girl: Whales are... big.
by MischiefMaker December 29, 2004
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Not needing a brain to operate task in question
Hey, working a till in Macdonalds is a no brainer which is just as well as chavs need the work
by Little Miss Mayonnaise May 26, 2005
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Something so obvious to be correct/appropriate, that it requires no contemplation to decide on.
It was a no-brainer for Zack to wear a condom when he banged that disease infected whore (ewwwww).
by efulitz January 8, 2004
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"Yo you know Shayna's a brainer right?"
"Word?"
"Ye man; go chop dat"
by TheCurryFairy September 7, 2006
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It's when you grab the skin between your hanging balls and your cock and then tighten your grip all the way up to your balls forcing them to really stick out, this makes your sac look veiny and bumpy like the top of a brain.
I asked my girl to examine a spot in my testes, when she came in for a closer look, I tightened up my grip and hit her in the eye with the brainer.
by allen powell January 17, 2006
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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.
by Three years later July 15, 2010
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