being someone who has a brain.
meaning you have a brain,
might also mean you are a normal human with a brain.
you might be called brainless / braindead if you're stupid or did something stupid.
i own a brain, i like having a brain, so don't fuck it up
A phrase made popular by the 1989 movie 'Heathers' and the 2014 musical of the same name. It is very similar in meaning to 'Are you retarded?'.
Heather Duke: Can I be red?
Heather Chandler: Did you have a brain tumor for breakfast? I'm always red
Heather McNamara: I've been looking forward to this all day!
Heather Duke: Did you have a brain tumor for breakfast?
to be extremely stupid(see also shit for brains)
Oh my gosh, did you really believe that Burger King had come out with a new diet called the Angus diet, you have shit for brains.
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Used when someone says or does something very stupid
Person 1:Iphone 6 is worth more than the new samsung!
Person 2:Do you have a brain dislocation?