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??
por JJRtwu2009 08 de Dezembro de 2008
1 more definition
a person who gives a lot of brain/head/blowjobs
Mary is a brain donor.
por stiff 10 de Outubro de 2004