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2.
When you have a crush on a person's brain, with complete disregard to appearance, availability, etc.
Laura has a braincrush on Thomas Jefferson.
by awesomeaardvark October 21, 2009
 
1.
wanting someone purely for their mind - has nothing to do with sexual attraction.
"i have such a brain crush on this kid in my philoshophy class. sure hes 5'3" and clearly never combs his hair, but he is so witty and articulate."
by woundedgazelle December 12, 2005