brain donor

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??

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brain donor

a person who gives a lot of brain/head/blowjobs

Mary is a brain donor.

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brain-donor card

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?!

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Brain transplant donor

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?"