Top Definition
Extremely stupid person, someone who acts as if they've already donated their brain to science--before they die. Clueless. Dumb as a rock.
OK, what brain donor thought it would be a good idea to leave beer in the freezer overnight??
by JJRtwu2009 December 08, 2008

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a person who gives a lot of brain/head/blowjobs
Mary is a brain donor.
by stiff October 10, 2004

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