Top Definition
1. (noun) a type of brain which functions best when the Sun is out

2. -ed (verb) to have planned or thought of at night time ONLY.

3. -ed (adj) a person who has vampire brain; a person who functions best at night; a person whose brain shuts down when the suns comes out; a genius at night
Examples:

Don't talk to Harry in the morning, you won't get any good ideas from him. He has a vampire brain.

"That movie was soooo awesome! I heard it was vampire brained."

The vampire brained girl panicked. She was running out of time, the sun was about to rise and her article wasn't finished yet.
by SlightlyBipolar August 10, 2011
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