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When your brain needs to sneeze, but it can't because it's a brain, so it just hurts.
This snowcone is giving me a brain sneeze.
by Rusty_Shackelford November 17, 2012
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2
Verb. The act of having a very important, funny, or rediculous idea but minutes later vanishes (as violently as a sneeze).
Ex 1.

Dustin: "So what where you going to say at lunch?"

Dillon: " I cant remeber i had a brain sneeze during fourth hour!"

Ex2.

"As I had the perfect idea for senior prank, a brain sneeze caught me off guard."
by Dillybob August 19, 2009
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