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 8, 2008
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A euphemism for marijuana. Instead of explicitly asking a random person for an illegal substance, it is used out of politeness and legal reasons.
Old hippy guy: Hey man... you got a brain-donor card?
Young dready: A brain-donor card? What the fuck is that?!
by Ryan Guide December 10, 2007
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Someone with no brain. AKA a friendly way to say "idiot".
Idiot: *says something stupid*
Person 1 : "Do you happen to be a brain transplant donor?"
by babyeater29126 April 28, 2015
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