
when you're excited to learn something new, eg. math, science. it's basically a boner in your brain a.ka brainer.
by soma689 April 25, 2013

Dude1: Hey, man, where's the basement?
Dude2: Try downstairs, bright spark!
Girl: Whales are... big.
Dude2: Try downstairs, bright spark!
Girl: Whales are... big.
by MischiefMaker December 28, 2003

by Little Miss Mayonnaise May 29, 2005

by TheCurryFairy September 07, 2006

A Brainer is when you do something because it had to be done and you knew it was the right thing to do.
by WolfBrother13le April 24, 2013

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 16, 2006
