having a brain

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

Did you have a brain tumor for breakfast?

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?

have shit for brains

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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do you have a brain dislocation

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?